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

Chemical Bonding | First Year Chemistry Past Paper MCQs

7 of 41 questions (Page 3 of 6)

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15 Total number of bonds in C₂H₄ molecule is:
Correct Answer: C
Explanation: C₂H₄ has 4 C-H single bonds + 1 C=C double bond = 5 bonds total.
16 The S.I unit of dipole moment is:
Correct Answer: C
Explanation: SI unit: C·m (coulomb-meter); 1 D = 3.336 × 10⁻³⁰ C·m.
17 Ionic, covalent and co-ordinate covalent bond are present in:
Correct Answer: B
Explanation: NH₄Cl: Ionic (NH₄⁺ + Cl⁻), covalent (N-H), and coordinate (N→H) bonds.
18 The highest electronegative element in the periodic table is:
Correct Answer: D
Explanation: Fluorine (EN = 3.98) is the most electronegative element.
19 Bond angle between H-S-H bonds is:
Correct Answer: C
Explanation: H₂S has bent geometry with ~92° bond angles (lone pairs reduce angle from 109.5°).
20 S.I Unit of dipole moment is:
Correct Answer: C
Explanation: SI unit: C·m (coulomb-meter); Debye (D) is a non-SI unit.
21 The amount of energy released by absorbing electron in the valence shell is:
Correct Answer: B
Explanation: Electron affinity is energy released when an atom gains an electron.
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