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-p-Block elements - I — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry-p-Block elements - I1 Mark
MCQ
The bond angle $H-X-H$ is the greatest in the compound
  • A
    $PH_3$
  • ✓
    $CH_4$
  • C
    $NH_3$
  • D
    $H_2O$
✓

Answer

Correct option: B.
$CH_4$
b
More the number of lone pairs on central atom, the greater is the contraction caused in the angle between bond pairs. In $PH_3$ the bond pairs of electrons are so much farther away from the central atom due to larger size. Thus the lone pair cause greater distortion in $PH_3$ . Hence the bond angle decreases to $98^o$ .

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