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

Chemical Bonding | First Year Chemistry Past Paper MCQs

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1 Which of the following molecules has a coordinate covalent bond?
Correct Answer: C
Explanation: NH₄Cl contains a coordinate covalent bond (N→H) in the NH₄⁺ ion.
2 The angle formed in sp hybridization is:
Correct Answer: B
Explanation: sp hybridization results in linear geometry with 180° bond angles (e.g., BeCl₂).
3 Ionic compounds are mostly obtained by the combination of group:
Correct Answer: D
Explanation: Group 1 (alkali metals) + Group 17 (halogens) form ionic compounds (e.g., NaCl).
4 Dipole moment of CO₂ is:
Correct Answer: B
Explanation: CO₂ is linear and symmetrical; bond dipoles cancel out (μ = 0).
5 In sp² hybridization, the orbitals are oriented at an angle of:
Correct Answer: B
Explanation: sp² hybridization gives trigonal planar geometry with 120° angles (e.g., BF₃).
6 Which of the following species has unpaired electron in anti-bonding molecular orbitals?
Correct Answer: D
Explanation: F₂ has unpaired electrons in its π* anti-bonding orbitals (σ2s² σ*2s² σ2p² π2p⁴ π*2p⁴).
7 A molecular orbital can contain maximum electrons equal to:
Correct Answer: B
Explanation: Each MO can hold 2 electrons with opposite spins (Pauli exclusion principle).
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