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The correct order of bond angles (smallest first) in $H_{2} S, {NH}_{3}, {BF}_{3}$ and ${SiH}_{4}$ is

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a

H_{2} S < {SiF}_{4} < {NH}_{3} < {BF}_{3}

b

{NH}_{3} < H_{2} S < {SiH}_{4} < {BF}_{3}

c

H_{2} S < {NH}_{3} < {SiH}_{4} < {BF}_{3}

d

H_{2} S < {NH}_{3} < {BF}_{3} < {SiH}_{4}

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detailed solution

Correct option is C

Bond angle is $H_{2} S$ is near to 90°. Bond angle in ${NH}_{3}$ is less than than 109°28' (a perfect tetrahedral angle) due to the electronic repulsion between lone pair and bonded pair. Bond angle in ${SiH}_{4}$ is 109°28'. Bond angle in ${BF}_{3}$ is 120°.

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