Chemical Bonding | First Year Chemistry Past Paper MCQs | mosaicbro.com

Chemical Bonding | First Year Chemistry Past Paper MCQs

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8 Carbon dioxide and methane have dipole moment value:
Correct Answer: A
Explanation: CO₂ (μ = 0, linear), CH₄ (μ = 0, tetrahedral), but CH₃Cl has μ ≈ 1.85 D.
9 Noble gases have maximum stability and least reactive because:
Correct Answer: B
Explanation: Full valence shells (ns² np⁶) make noble gases chemically inert.
10 Which species has unpaired electron in anti-bonding molecular orbitals?
Correct Answer: D
Explanation: F₂'s MO configuration places electrons in π* anti-bonding orbitals.
11 Octet rule is not followed in the formation of:
Correct Answer: D
Explanation: PCl₅ violates the octet rule (P has 10 electrons, expanded octet).
12 The most stable elements are:
Correct Answer: C
Explanation: Noble gases have complete valence shells and minimal reactivity.
13 The hybridization of carbon in C₂H₄ is:
Correct Answer: B
Explanation: C₂H₄ (ethylene) has sp² hybridized carbons forming trigonal planar geometry.
14 Positive ions are called:
Correct Answer: A
Explanation: Cations are positively charged ions (e.g., Na⁺).
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