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BITSAT Chemistry MCQ Practice

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1. Which of the following alcohols would be expected to react fastest with Lucas reagent (via the SN1 mechanism) due to carbocation stability: primary, secondary, or tertiary?

  1. A. All react at the same rate
  2. B. Secondary alcohol
  3. C. Tertiary alcohol
  4. D. Primary alcohol
Answer: Tertiary alcohol
Explanation: Tertiary alcohol — verified fact for BITSAT Chemistry.
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2. In alkyl halides, the carbon-halogen bond is polarised such that the carbon atom carries a partial charge of:

  1. A. Partial positive (δ+), since halogen is more electronegative
  2. B. No charge at all; the bond is completely non-polar
  3. C. Partial negative (δ-)
  4. D. Full positive charge (+1)
Answer: Partial positive (δ+), since halogen is more electronegative
Explanation: Partial positive (δ+), since halogen is more electronegative — verified fact for BITSAT Chemistry.
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3. Which test is commonly used to detect the presence of an aldehyde group using Fehling's solution, based on the colour of the precipitate formed?

  1. A. Formation of a blue precipitate of Cu(OH)₂ that persists unchanged
  2. B. Formation of a brick-red precipitate of Cu₂O
  3. C. Formation of a white precipitate of AgCl
  4. D. No visible change occurs
Answer: Formation of a brick-red precipitate of Cu₂O
Explanation: Formation of a brick-red precipitate of Cu₂O — verified fact for BITSAT Chemistry.
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4. Which functional group isomerism relationship exists between an aldehyde and a ketone with the same molecular formula (e.g., propanal and propanone... note propanone has 3 carbons and propanal has 3 carbons but different connectivity)? More precisely, butanal and butan-2-one share the same molecular formula C₄H₈O — what type of isomerism is this?

  1. A. Chain isomerism
  2. B. Geometrical isomerism
  3. C. Position isomerism
  4. D. Functional group isomerism
Answer: Functional group isomerism
Explanation: Functional group isomerism — verified fact for BITSAT Chemistry.
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5. What is the IUPAC name of the compound CH₃-CH₂-NH₂?

  1. A. Methanamine
  2. B. Ethanamide
  3. C. Ethanol
  4. D. Ethanamine
Answer: Ethanamine
Explanation: Ethanamine — verified fact for BITSAT Chemistry.
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6. Which acid-base theory defines acids and bases strictly in terms of proton (H⁺) donation and acceptance, without reference to electron pairs?

  1. A. Lewis theory
  2. B. VSEPR theory
  3. C. Arrhenius theory only covers bases, not this distinction
  4. D. Bronsted-Lowry theory
Answer: Bronsted-Lowry theory
Explanation: Bronsted-Lowry theory — verified fact for BITSAT Chemistry.
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7. What is the basicity (denticity considerations aside) of ethylenediamine (en) as a ligand?

  1. A. Bidentate (binds through two nitrogen atoms)
  2. B. Monodentate
  3. C. Tridentate
  4. D. Hexadentate
Answer: Bidentate (binds through two nitrogen atoms)
Explanation: Bidentate (binds through two nitrogen atoms) — verified fact for BITSAT Chemistry.
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8. Which of the following ions is expected to be coloured due to the presence of unpaired d-electrons: Sc³⁺ or Ti³⁺?

  1. A. Ti³⁺ (has one unpaired 3d electron)
  2. B. Neither ion is coloured
  3. C. Sc³⁺ (has no d electrons)
  4. D. Both are equally coloured
Answer: Ti³⁺ (has one unpaired 3d electron)
Explanation: Ti³⁺ (has one unpaired 3d electron) — verified fact for BITSAT Chemistry.
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9. Which of the following best explains why transition metals commonly show variable oxidation states?

  1. A. They have no valence electrons
  2. B. The (n-1)d and ns electrons have comparable energies and can both participate in bonding
  3. C. They belong only to Group 1
  4. D. They have completely filled d-orbitals only
Answer: The (n-1)d and ns electrons have comparable energies and can both participate in bonding
Explanation: The (n-1)d and ns electrons have comparable energies and can both participate in bonding — verified fact for BITSAT Chemistry.
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10. What is the geometry of the [Ni(CO)₄] complex, given its sp³ hybridisation?

  1. A. Octahedral
  2. B. Square planar
  3. C. Linear
  4. D. Tetrahedral
Answer: Tetrahedral
Explanation: Tetrahedral — verified fact for BITSAT Chemistry.
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11. For the equilibrium PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), what is the effect of decreasing the volume of the container (increasing pressure) on the equilibrium?

  1. A. Equilibrium shifts backward, favouring PCl₅ (fewer gas moles)
  2. B. Equilibrium shifts forward, favouring PCl₃ and Cl₂
  3. C. No effect on equilibrium position
  4. D. The reaction stops completely
Answer: Equilibrium shifts backward, favouring PCl₅ (fewer gas moles)
Explanation: Equilibrium shifts backward, favouring PCl₅ (fewer gas moles) — verified fact for BITSAT Chemistry.
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12. Which of the following statements about catalysts is correct?

  1. A. A catalyst is completely consumed during the reaction
  2. B. A catalyst shifts the equilibrium position toward products
  3. C. A catalyst increases the enthalpy of reactants
  4. D. A catalyst is not consumed in the overall reaction and does not change the equilibrium position
Answer: A catalyst is not consumed in the overall reaction and does not change the equilibrium position
Explanation: A catalyst is not consumed in the overall reaction and does not change the equilibrium position — verified fact for BITSAT Chemistry.
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13. What is the pOH of a solution with pH = 9 at 25°C (using pH + pOH = 14)?

  1. A. 4.5
  2. B. 5
  3. C. 14
  4. D. 9
Answer: 5
Explanation: 5 — verified fact for BITSAT Chemistry.
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14. Which of the following best describes an isothermal process?

  1. A. A process where no heat is exchanged with surroundings
  2. B. A process that occurs at constant temperature
  3. C. A process that occurs at constant volume
  4. D. A process that occurs at constant pressure
Answer: A process that occurs at constant temperature
Explanation: A process that occurs at constant temperature — verified fact for BITSAT Chemistry.
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15. For the first-order decomposition of a substance, if the initial concentration is 0.8 M and after one half-life the concentration becomes 0.4 M, what will the concentration be after two half-lives?

  1. A. 0.3 M
  2. B. 0.2 M
  3. C. 0.1 M
  4. D. 0.4 M
Answer: 0.2 M
Explanation: 0.2 M — verified fact for BITSAT Chemistry.
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16. What is the molarity of a solution containing 4 g of NaOH (molar mass 40 g/mol) dissolved in 500 mL of solution?

  1. A. 0.2 M
  2. B. 2 M
  3. C. 0.1 M
  4. D. 0.4 M
Answer: 0.2 M
Explanation: 0.2 M — verified fact for BITSAT Chemistry.
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17. Natural rubber is a polymer of which monomer unit?

  1. A. Ethylene
  2. B. Vinyl chloride
  3. C. Isoprene (2-methylbuta-1,3-diene)
  4. D. Styrene
Answer: Isoprene (2-methylbuta-1,3-diene)
Explanation: Isoprene (2-methylbuta-1,3-diene) — verified fact for BITSAT Chemistry.
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18. Which type of polymerisation involves monomers joining together with the loss of a small molecule such as water?

  1. A. Condensation polymerisation
  2. B. Chain polymerisation only, without any byproduct
  3. C. Free radical addition polymerisation only
  4. D. Addition polymerisation
Answer: Condensation polymerisation
Explanation: Condensation polymerisation — verified fact for BITSAT Chemistry.
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19. Nylon-6,6 is an example of which class of polymer, based on the type of linkage joining its monomer units?

  1. A. Elastomer formed by addition polymerisation only
  2. B. Condensation polymer (formed via amide linkages)
  3. C. Addition polymer
  4. D. Natural polymer
Answer: Condensation polymer (formed via amide linkages)
Explanation: Condensation polymer (formed via amide linkages) — verified fact for BITSAT Chemistry.
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20. Polythene (polyethylene) is formed by the polymerisation of which monomer?

  1. A. Vinyl chloride
  2. B. Ethylene (ethene, CH₂=CH₂)
  3. C. Propylene (propene)
  4. D. Styrene
Answer: Ethylene (ethene, CH₂=CH₂)
Explanation: Ethylene (ethene, CH₂=CH₂) — verified fact for BITSAT Chemistry.
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21. Toluene undergoes electrophilic substitution faster than benzene because the methyl group is a(n):

  1. A. Strongly electron-withdrawing group
  2. B. Deactivating, meta-directing group
  3. C. Activating, ortho/para-directing group (electron-donating by hyperconjugation)
  4. D. Non-directing, inert group
Answer: Activating, ortho/para-directing group (electron-donating by hyperconjugation)
Explanation: Activating, ortho/para-directing group (electron-donating by hyperconjugation) — verified fact for BITSAT Chemistry.
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22. In the nitration of benzene, which electrophile attacks the benzene ring?

  1. A. Nitrate ion (NO₃⁻)
  2. B. Ammonium ion (NH₄⁺)
  3. C. Nitronium ion (NO₂⁺)
  4. D. Nitrogen dioxide radical (NO₂•)
Answer: Nitronium ion (NO₂⁺)
Explanation: Nitronium ion (NO₂⁺) — verified fact for BITSAT Chemistry.
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23. According to Huckel's rule, a planar cyclic molecule is aromatic if it has how many delocalised pi electrons (for the smallest case)?

  1. A. 10
  2. B. 6 (following the 4n+2 rule with n = 1)
  3. C. 4
  4. D. 8
Answer: 6 (following the 4n+2 rule with n = 1)
Explanation: 6 (following the 4n+2 rule with n = 1) — verified fact for BITSAT Chemistry.
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24. Which of the following reactions is characteristic of benzene due to its aromatic stability: electrophilic substitution or electrophilic addition?

  1. A. Electrophilic substitution
  2. B. Electrophilic addition
  3. C. Free radical addition
  4. D. Nucleophilic substitution
Answer: Electrophilic substitution
Explanation: Electrophilic substitution — verified fact for BITSAT Chemistry.
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25. What is the molecular formula of benzene?

  1. A. C₅H₅
  2. B. C₆H₁₄
  3. C. C₆H₆
  4. D. C₆H₁₂
Answer: C₆H₆
Explanation: C₆H₆ — verified fact for BITSAT Chemistry.
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26. Which functional group is present in both aldehydes and ketones, distinguishing them as carbonyl compounds?

  1. A. C=O (carbonyl group)
  2. B. -OH (hydroxyl group)
  3. C. -COOH (carboxyl group)
  4. D. -NH₂ (amine group)
Answer: C=O (carbonyl group)
Explanation: C=O (carbonyl group) — verified fact for BITSAT Chemistry.
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27. Carboxylic acids are generally more acidic than alcohols mainly because of:

  1. A. A larger molecular size
  2. B. A lower boiling point
  3. C. Resonance stabilisation of the carboxylate anion formed after deprotonation
  4. D. The presence of more hydrogen atoms
Answer: Resonance stabilisation of the carboxylate anion formed after deprotonation
Explanation: Resonance stabilisation of the carboxylate anion formed after deprotonation — verified fact for BITSAT Chemistry.
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28. Primary alcohols on oxidation with a mild oxidising agent like PCC typically form which functional group first?

  1. A. Ketone
  2. B. Carboxylic acid directly
  3. C. Ether
  4. D. Aldehyde
Answer: Aldehyde
Explanation: Aldehyde — verified fact for BITSAT Chemistry.
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29. Which class of organic compounds is generally more basic due to the lone pair of electrons on nitrogen: amines or amides?

  1. A. Both are equally basic
  2. B. Amines
  3. C. Amides
  4. D. Neither is basic
Answer: Amines
Explanation: Amines — verified fact for BITSAT Chemistry.
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30. Carboxylic acids react with alcohols in the presence of an acid catalyst to form which class of compound (esterification)?

  1. A. Aldehydes
  2. B. Amides
  3. C. Esters
  4. D. Ethers
Answer: Esters
Explanation: Esters — verified fact for BITSAT Chemistry.
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31. Which of the following reagents is commonly used to distinguish aldehydes from ketones (Tollens' test)?

  1. A. Ammoniacal silver nitrate (Tollens' reagent), which aldehydes reduce to form a silver mirror
  2. B. Sodium chloride solution
  3. C. Dilute sulphuric acid only
  4. D. Sodium hydroxide alone
Answer: Ammoniacal silver nitrate (Tollens' reagent), which aldehydes reduce to form a silver mirror
Explanation: Ammoniacal silver nitrate (Tollens' reagent), which aldehydes reduce to form a silver mirror — verified fact for BITSAT Chemistry.
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32. Which functional group is characteristic of alcohols?

  1. A. -COOH (carboxyl group)
  2. B. -CHO (aldehyde group)
  3. C. -NH₂ (amine group)
  4. D. -OH (hydroxyl group)
Answer: -OH (hydroxyl group)
Explanation: -OH (hydroxyl group) — verified fact for BITSAT Chemistry.
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33. A homolytic bond cleavage produces which type of reactive intermediate?

  1. A. Carbanions
  2. B. Carbocations
  3. C. Zwitterions
  4. D. Free radicals
Answer: Free radicals
Explanation: Free radicals — verified fact for BITSAT Chemistry.
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34. In an E2 elimination reaction, what is generally removed from adjacent carbon atoms to form a double bond?

  1. A. A hydrogen atom and a leaving group (anti-periplanar elimination)
  2. B. Two leaving groups only
  3. C. Two hydrogen atoms only
  4. D. A carbon atom itself
Answer: A hydrogen atom and a leaving group (anti-periplanar elimination)
Explanation: A hydrogen atom and a leaving group (anti-periplanar elimination) — verified fact for BITSAT Chemistry.
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35. Tertiary alkyl halides generally favour which substitution mechanism over the other, due to the stability of the intermediate formed?

  1. A. E2 elimination is always exclusively favoured instead
  2. B. Neither mechanism is favoured
  3. C. SN1 (favoured due to a more stable tertiary carbocation)
  4. D. SN2 (favoured due to less steric hindrance)
Answer: SN1 (favoured due to a more stable tertiary carbocation)
Explanation: SN1 (favoured due to a more stable tertiary carbocation) — verified fact for BITSAT Chemistry.
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36. An SN2 reaction mechanism is characterised by which of the following?

  1. A. No dependence on the nature of the leaving group
  2. B. Formation of a stable carbocation intermediate
  3. C. A single concerted step with backside attack, causing inversion of configuration
  4. D. Two separate steps with a carbanion intermediate
Answer: A single concerted step with backside attack, causing inversion of configuration
Explanation: A single concerted step with backside attack, causing inversion of configuration — verified fact for BITSAT Chemistry.
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37. An SN1 reaction mechanism proceeds through which type of intermediate?

  1. A. A carbanion intermediate
  2. B. A carbocation intermediate
  3. C. No intermediate; it is a single concerted step
  4. D. A free radical intermediate
Answer: A carbocation intermediate
Explanation: A carbocation intermediate — verified fact for BITSAT Chemistry.
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38. 1-propanol and 2-propanol differ in the position of the -OH group on the carbon chain. What type of isomerism is this?

  1. A. Position isomerism
  2. B. Metamerism
  3. C. Chain isomerism
  4. D. Functional group isomerism
Answer: Position isomerism
Explanation: Position isomerism — verified fact for BITSAT Chemistry.
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39. What is the relationship between two enantiomers of a chiral molecule?

  1. A. They are identical in all physical and chemical properties including optical rotation direction
  2. B. They have different molecular formulas
  3. C. They differ in the position of a functional group
  4. D. They are non-superimposable mirror images of each other
Answer: They are non-superimposable mirror images of each other
Explanation: They are non-superimposable mirror images of each other — verified fact for BITSAT Chemistry.
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40. A carbon atom bonded to four different groups is called a chiral centre. Molecules containing such a centre typically exhibit which type of isomerism?

  1. A. Chain isomerism
  2. B. Optical isomerism
  3. C. Ring-chain isomerism
  4. D. Geometrical isomerism
Answer: Optical isomerism
Explanation: Optical isomerism — verified fact for BITSAT Chemistry.
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41. Cis-2-butene and trans-2-butene are examples of which type of isomerism?

  1. A. Chain isomerism
  2. B. Geometrical (cis-trans) isomerism
  3. C. Tautomerism
  4. D. Optical isomerism
Answer: Geometrical (cis-trans) isomerism
Explanation: Geometrical (cis-trans) isomerism — verified fact for BITSAT Chemistry.
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42. Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same molecular formula but different structures. What type of isomerism is this?

  1. A. Metamerism
  2. B. Position isomerism
  3. C. Functional group isomerism
  4. D. Chain isomerism
Answer: Functional group isomerism
Explanation: Functional group isomerism — verified fact for BITSAT Chemistry.
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43. Butane (C₄H₁₀) and isobutane are examples of which type of isomerism?

  1. A. Position isomerism
  2. B. Chain (skeletal) isomerism
  3. C. Functional group isomerism
  4. D. Geometrical isomerism
Answer: Chain (skeletal) isomerism
Explanation: Chain (skeletal) isomerism — verified fact for BITSAT Chemistry.
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44. What is the IUPAC name of the compound (CH₃)₃C-OH?

  1. A. 2-Methylpropan-1-ol
  2. B. Butan-1-ol
  3. C. 2,2-Dimethylethanol
  4. D. 2-Methylpropan-2-ol
Answer: 2-Methylpropan-2-ol
Explanation: 2-Methylpropan-2-ol — verified fact for BITSAT Chemistry.
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45. What is the IUPAC name of the compound CH₃-CH₂-CH₂-CHO?

  1. A. Butanol
  2. B. Butanone
  3. C. Butanoic acid
  4. D. Butanal
Answer: Butanal
Explanation: Butanal — verified fact for BITSAT Chemistry.
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46. What is the IUPAC name of CH₂=CH-CH₃?

  1. A. Propanol
  2. B. Propyne
  3. C. Propane
  4. D. Propene
Answer: Propene
Explanation: Propene — verified fact for BITSAT Chemistry.
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47. What is the IUPAC name of CH₃-CH₂-OH?

  1. A. Ethanal
  2. B. Ethanoic acid
  3. C. Methanol
  4. D. Ethanol
Answer: Ethanol
Explanation: Ethanol — verified fact for BITSAT Chemistry.
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48. What is the IUPAC name of CH₃-CH₂-COOH?

  1. A. Ethanoic acid
  2. B. Propanoic acid
  3. C. Propanal
  4. D. Propan-1-ol
Answer: Propanoic acid
Explanation: Propanoic acid — verified fact for BITSAT Chemistry.
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49. What is the IUPAC name of CH₃-CO-CH₃?

  1. A. Propan-1-ol
  2. B. Propan-2-one (acetone)
  3. C. Propanal
  4. D. Propanoic acid
Answer: Propan-2-one (acetone)
Explanation: Propan-2-one (acetone) — verified fact for BITSAT Chemistry.
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50. What is the IUPAC name of the compound CH₃-CH(CH₃)-CH₂-CH₃?

  1. A. 2-Methylbutane
  2. B. 2-Methylpropane
  3. C. Pentane
  4. D. 3-Methylbutane
Answer: 2-Methylbutane
Explanation: 2-Methylbutane — verified fact for BITSAT Chemistry.
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51. To balance the half-reaction Fe²⁺ → Fe³⁺ + e⁻, this reaction represents:

  1. A. Reduction (gain of an electron)
  2. B. Neutralisation
  3. C. Disproportionation
  4. D. Oxidation (loss of an electron)
Answer: Oxidation (loss of an electron)
Explanation: Oxidation (loss of an electron) — verified fact for BITSAT Chemistry.
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52. What is the oxidation state of chromium in the dichromate ion, Cr₂O₇²⁻?

  1. A. +7
  2. B. +2
  3. C. +6
  4. D. +3
Answer: +6
Explanation: +6 — verified fact for BITSAT Chemistry.
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53. In a redox reaction, the substance that gains electrons is called the:

  1. A. Catalyst
  2. B. Reducing agent
  3. C. Oxidising agent
  4. D. Buffer
Answer: Oxidising agent
Explanation: Oxidising agent — verified fact for BITSAT Chemistry.
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54. In the compound KMnO₄, manganese exhibits which oxidation state?

  1. A. +7
  2. B. +2
  3. C. +4
  4. D. +6
Answer: +7
Explanation: +7 — verified fact for BITSAT Chemistry.
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55. In the reaction Zn + CuSO₄ → ZnSO₄ + Cu, which species is oxidised?

  1. A. Cu (copper metal)
  2. B. Zn (zinc)
  3. C. Cu²⁺ (copper ion)
  4. D. SO₄²⁻ (sulphate ion)
Answer: Zn (zinc)
Explanation: Zn (zinc) — verified fact for BITSAT Chemistry.
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56. What is the conjugate base of the acid H₂SO₄ after it donates one proton?

  1. A. SO₃²⁻
  2. B. SO₄²⁻
  3. C. HSO₄⁻
  4. D. H₃SO₄⁺
Answer: HSO₄⁻
Explanation: HSO₄⁻ — verified fact for BITSAT Chemistry.
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57. BF₃ acts as a Lewis acid because it:

  1. A. Has a lone pair of electrons to donate
  2. B. Readily donates a proton
  3. C. Has a complete octet and is chemically inert
  4. D. Has an incomplete octet on boron and can accept an electron pair
Answer: Has an incomplete octet on boron and can accept an electron pair
Explanation: Has an incomplete octet on boron and can accept an electron pair — verified fact for BITSAT Chemistry.
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58. At 25°C, a chemically neutral aqueous solution has a pH value of:

  1. A. 1
  2. B. 0
  3. C. 7
  4. D. 14
Answer: 7
Explanation: 7 — verified fact for BITSAT Chemistry.
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59. What is the pH of a 0.01 M HCl solution, assuming complete dissociation?

  1. A. 7
  2. B. 2
  3. C. 1
  4. D. 12
Answer: 2
Explanation: 2 — verified fact for BITSAT Chemistry.
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60. According to the Lewis theory, a Lewis base is defined as a species that:

  1. A. Donates an electron pair
  2. B. Donates a proton
  3. C. Accepts a proton
  4. D. Accepts an electron pair
Answer: Donates an electron pair
Explanation: Donates an electron pair — verified fact for BITSAT Chemistry.
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61. According to the Bronsted-Lowry theory, an acid is defined as a substance that:

  1. A. Donates an electron pair
  2. B. Accepts a hydroxide ion
  3. C. Donates a proton (H⁺)
  4. D. Accepts a proton (H⁺)
Answer: Donates a proton (H⁺)
Explanation: Donates a proton (H⁺) — verified fact for BITSAT Chemistry.
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62. In coordination chemistry, a ligand that can bind to a metal ion through two donor atoms simultaneously is called:

  1. A. Ambidentate ligand only
  2. B. Non-coordinating ligand
  3. C. Monodentate ligand
  4. D. Bidentate ligand
Answer: Bidentate ligand
Explanation: Bidentate ligand — verified fact for BITSAT Chemistry.
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63. A complex is diamagnetic if all its electrons in the d-orbitals are:

  1. A. In an excited state
  2. B. Unpaired
  3. C. Removed entirely
  4. D. Paired
Answer: Paired
Explanation: Paired — verified fact for BITSAT Chemistry.
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64. What is the IUPAC name of the complex [Cu(NH₃)₄]SO₄?

  1. A. Tetraamminecopper(I) sulphate
  2. B. Ammine copper sulphate
  3. C. Copper tetraammine sulphate(IV)
  4. D. Tetraamminecopper(II) sulphate
Answer: Tetraamminecopper(II) sulphate
Explanation: Tetraamminecopper(II) sulphate — verified fact for BITSAT Chemistry.
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65. According to Werner's theory, what is the term for the number of ligand donor atoms directly bonded to the central metal ion?

  1. A. Primary valency only
  2. B. Oxidation number
  3. C. Coordination number
  4. D. Denticity of the complex
Answer: Coordination number
Explanation: Coordination number — verified fact for BITSAT Chemistry.
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66. What is the oxidation state of cobalt in the complex [Co(NH₃)₆]Cl₃?

  1. A. 0
  2. B. +3
  3. C. +6
  4. D. +2
Answer: +3
Explanation: +3 — verified fact for BITSAT Chemistry.
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67. What is the coordination number of the central metal ion in the complex [Co(NH₃)₆]³⁺?

  1. A. 4
  2. B. 3
  3. C. 2
  4. D. 6
Answer: 6
Explanation: 6 — verified fact for BITSAT Chemistry.
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68. Which of these s-block elements imparts a characteristic brick-red colour to a flame test?

  1. A. Lithium
  2. B. Potassium
  3. C. Calcium
  4. D. Sodium
Answer: Calcium
Explanation: Calcium — verified fact for BITSAT Chemistry.
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69. Which element is called the 'metalloid' that is widely used as a semiconductor in the electronics industry?

  1. A. Carbon
  2. B. Silicon
  3. C. Sulphur
  4. D. Phosphorus
Answer: Silicon
Explanation: Silicon — verified fact for BITSAT Chemistry.
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70. Which halogen exists as a liquid at room temperature?

  1. A. Chlorine
  2. B. Bromine
  3. C. Fluorine
  4. D. Iodine
Answer: Bromine
Explanation: Bromine — verified fact for BITSAT Chemistry.
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71. Which noble gas is used in balloons and airships due to its low density and inertness?

  1. A. Neon
  2. B. Xenon
  3. C. Helium
  4. D. Argon
Answer: Helium
Explanation: Helium — verified fact for BITSAT Chemistry.
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72. Which of the following is the most common oxidation state shown by alkaline earth metals (Group 2) in their compounds?

  1. A. +3
  2. B. +1
  3. C. +2
  4. D. -2
Answer: +2
Explanation: +2 — verified fact for BITSAT Chemistry.
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73. Which group of the periodic table is known as the alkali metals?

  1. A. Group 2
  2. B. Group 17
  3. C. Group 1
  4. D. Group 18
Answer: Group 1
Explanation: Group 1 — verified fact for BITSAT Chemistry.
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74. Which of these has the highest second ionisation energy considering the noble gas configuration reached after removing one electron: Na or Mg?

  1. A. Neither has a defined second ionisation energy
  2. B. Na (removing a second electron breaks a stable noble-gas-like Ne configuration)
  3. C. Mg
  4. D. Both are equal
Answer: Na (removing a second electron breaks a stable noble-gas-like Ne configuration)
Explanation: Na (removing a second electron breaks a stable noble-gas-like Ne configuration) — verified fact for BITSAT Chemistry.
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75. Why is the ionic radius of a cation always smaller than the atomic radius of its parent atom?

  1. A. Because removing electrons reduces electron-electron repulsion and effective nuclear attraction increases per electron
  2. B. Because the atomic mass decreases significantly
  3. C. Because protons are lost along with electrons
  4. D. Because the nucleus shrinks when electrons are removed
Answer: Because removing electrons reduces electron-electron repulsion and effective nuclear attraction increases per electron
Explanation: Because removing electrons reduces electron-electron repulsion and effective nuclear attraction increases per electron — verified fact for BITSAT Chemistry.
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76. Which of these elements has the highest electronegativity: F, Cl, Br, I?

  1. A. Cl
  2. B. I
  3. C. F
  4. D. Br
Answer: F
Explanation: F — verified fact for BITSAT Chemistry.
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77. How does ionisation energy generally change on moving down a group in the periodic table?

  1. A. It generally decreases
  2. B. It generally increases
  3. C. It remains constant
  4. D. It becomes negative
Answer: It generally decreases
Explanation: It generally decreases — verified fact for BITSAT Chemistry.
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78. How does atomic radius generally change on moving from left to right across a period?

  1. A. It generally increases
  2. B. It remains constant
  3. C. It first increases then decreases
  4. D. It generally decreases
Answer: It generally decreases
Explanation: It generally decreases — verified fact for BITSAT Chemistry.
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79. What is the van't Hoff factor (i) for a solute like NaCl that undergoes complete dissociation into 2 ions in dilute aqueous solution?

  1. A. 2
  2. B. 0.5
  3. C. 4
  4. D. 1
Answer: 2
Explanation: 2 — verified fact for BITSAT Chemistry.
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80. Adding a non-volatile solute to a pure solvent causes the boiling point of the solution to:

  1. A. Increase (elevation in boiling point)
  2. B. Become equal to the freezing point
  3. C. Remain unchanged
  4. D. Decrease
Answer: Increase (elevation in boiling point)
Explanation: Increase (elevation in boiling point) — verified fact for BITSAT Chemistry.
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