Q.

The bond angle H - X - H is the greatest in the compound:

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a

H2O

b

PH3

c

CH4

d

NH3

answer is B.

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Detailed Solution

CH4 has the greatest H - C - H bond angle. The other molecules have lone pair(s) of electrons. Due to lone pair-bonding pair repulsion, the angle H - X - H is decreased from the expected bond angle of tetrahedral structure. i.e. 109° 28'.

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The bond angle H - X - H is the greatest in the compound: