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Question

The correct order of bond angles (smallest first) in H2S, NH3, BF3 and SiH4 is-


A

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B

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C

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D

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Solution

The correct option is A


Let's, try to determine the geometry and structure of each compound.
H2Sep=V+L+AC2=6+22=4Tetrahedral

NH3ep=V+L+AC2=5+32=4Tetrahedral

SiH4ep=4+42=4Tetrahedral

BF3ep=3+32=3 Trigonal Planar

H2S

NH3

SiH4

BF3


In trigonal Planar, the bond angle is 120o. The angles for the other compounds correspond to:
NH3 Around 107o
H2S Around 104.5o
SiH4 Around 109.5o
Therefore, the order will be
H2S< NH3< SiH4< BF3


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