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4. Chemical bonding and molecular structure — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry4. Chemical bonding and molecular structure1 Mark
MCQ
Assertion : Bond angle of $H_2S$ is smaller than $H_2O$.
Reason : Electronegativity of the central atom increases, bond angle decreases.
  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
  • ✓
    If the Assertion is correct but Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.
✓

Answer

Correct option: C.
If the Assertion is correct but Reason is incorrect.
c
Bond angle of $H_2S\, (92^o) < H_2O\, (104^o31)$. As the electronegativity of the central atom decreases, bond angle decreases. In the present case, $S$ is less electronegative than oxygen. Thus bond pairs in $H_2S$ are more away from the central atom than in $H_2O$ and thus repulsive forces between bond pairs are smaller producing smaller bond angle.

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