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

Chemical Bonding | First Year Chemistry Past Paper MCQs

6 of 41 questions (Page 6 of 6)

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36 Which is not isoelectronic with the rest?
Correct Answer: B
Explanation: Na⁺ (10 e⁻) vs. K⁺/Cl⁻/S²⁻ (18 e⁻).
37 Which hydrogen halide has the highest percentage of acid character?
Correct Answer: D
Explanation: Acid strength increases down Group 17: HI > HBr > HCl > HF (weaker bond).
38 The four equivalent sp³ hybrid orbitals in space are at an angle of:
Correct Answer: D
Explanation: sp³ orbitals point to tetrahedral corners (109.5°).
39 Total number of sigma bonds in Ethyne (C₂H₂) are:
Correct Answer: B
Explanation: C₂H₂ has 2 C-H σ bonds + 1 C≡C σ bond = 3 σ bonds total.
40 Bond formed by mutual sharing of electrons is called:
Correct Answer: B
Explanation: Covalent bonds involve shared electron pairs between atoms.
41 Formation of chemical bond takes place when:
Correct Answer: D
Explanation: Bonds form when attractive forces (nucleus-electron) exceed repulsive forces (electron-electron/nucleus-nucleus).
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