Chemistry MCQs for 2nd Year (Punjab Board)

This page has over 32,500 multiple-choice questions for Chemistry (2nd Year (Punjab Board)), arranged in 17 chapters and 260 topics. The chapters include Group 2 Elements, Transition Metals, Basics of Organic Chemistry, Aromatic Hydrocarbons and Halogenoalkanes. Every question has four options, an instant answer and, where available, a short explanation.

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Chapters and topics

  • Group 2 Elements 14 topics · 1777 MCQs
  • Transition Metals 19 topics · 2284 MCQs
  • Basics of Organic Chemistry 17 topics · 2162 MCQs
  • Aromatic Hydrocarbons 15 topics · 1655 MCQs
  • Halogenoalkanes 17 topics · 2734 MCQs
  • Hydroxy Compounds 17 topics · 2308 MCQs
  • Carbonyl Compounds and Carboxylic Acids 21 topics · 2632 MCQs
  • Organic Nitrogen Compounds 16 topics · 1852 MCQs
  • Organic Synthesis 12 topics · 1342 MCQs
  • Polymers 15 topics · 2112 MCQs
  • Biochemistry 20 topics · 2633 MCQs
  • Chromatography 9 topics · 1037 MCQs
  • Spectroscopy-1 13 topics · 1622 MCQs
  • Spectroscopy-2 (NMR) 11 topics · 1378 MCQs
  • Materials and Energy 13 topics · 1572 MCQs
  • Medicine, Agriculture and Industry 18 topics · 2035 MCQs
  • Water 13 topics · 1391 MCQs

Sample Chemistry MCQs

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Q1. Which Group 2 element has a density of 1.85 g cm⁻³?

  1. Be
  2. Ca
  3. Sr
  4. Mg
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Answer: A. Be

The density does not change regularly down the group, because of the different packing of the atoms. Values: Be 1.85 g cm⁻³; Mg 1.74 g cm⁻³; Ca 1.54 g cm⁻³; Sr 2.64 g cm⁻³; Ba 3.51 g cm⁻³.

Q2. About configurations, which of the following correctly describes the Fe³⁺ ion?

  1. [Ar] 3d⁵ 4s¹, which gives a half-filled 3d subshell
  2. [Ar] 3d⁸ 4s²
  3. [Ar] 3d⁵, with a half-filled 3d subshell
  4. [Ar] 3d⁵ 4s²
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Answer: C. [Ar] 3d⁵, with a half-filled 3d subshell

The Fe³⁺ ion: [Ar] 3d⁵, with a half-filled 3d subshell.

Q3. The functional group in CH₃CH₂COOH (propanoic acid) is:

  1. –COOH (carboxyl)
  2. –OH (hydroxyl)
  3. –Br (halo)
  4. –NH₂ (amino)
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Answer: A. –COOH (carboxyl)

CH₃CH₂COOH is a carboxylic acid: the functional group is –COOH (carboxyl).

Q4. Which statement about the orbital structure of benzene is correct?

  1. The σ framework of benzene is planar
  2. Each carbon atom of benzene is sp³ hybridized
  3. The σ framework of benzene is not planar
  4. The π electron cloud lies in the plane of the ring
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Answer: A. The σ framework of benzene is planar

The correct answer is “The σ framework of benzene is planar”. The σ framework of benzene is planar.

Q5. The molecular formula of 1-bromopentane is:

  1. C₅H₁₀Br
  2. C₆H₁₁Br
  3. C₅H₉Br
  4. C₅H₁₁Br
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Answer: D. C₅H₁₁Br

Monohalogenoalkane CₙH₂ₙ₊₁X with n = 5: C₅H₁₁Br.

Q6. Which of the following is described as follows: the methoxide ion, CH₃O⁻?

  1. the conjugate base of methanol
  2. an alkyl group attached to the oxygen of an alcohol
  3. the stronger acid of methanol and ethanol
  4. the conjugate base of ethanol
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Answer: A. the conjugate base of methanol

The conjugate base of methanol: the methoxide ion, CH₃O⁻.

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