Statement I : In 15^th group hydrides, Down the group, bond angle decreases.
Statement II : In 15^th group hydrides, Down the group, electronegativity of cental atom decreases.

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Both (I) & (II) are True

Both (I) & (II) are false

(I) is true & (II) is false

(I) is false & (II) is True

answer is A.

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Detailed Solution

Bond angle in 15^th group hydrides

NH₃ (107.8^o) > PH₃(93.6^o) > AsH₃(91.8^o)> SbH₃(91.3^o)

Bent rule:

Let us compare NH₃ and SbH₃,

Central atom contains a lone pair on both of them

EN of 'N' > EN of 'Sb'.

Bond pairs in NH₃ are closer to 'N', influence of lone pair is lesser.

Thus LP - BP repulsions are lesser in NH₃ & bond angle is larger.

Bond pairs in SbH₃ are farther to 'Sb', influence of lone pair is greater.

$∴$ LP - BP repulsions are greater in SbH₃ & bond angle is lesser.

Conclusion : In case of similar compounds in which , the central atom contains lone pair ,

As the EN of central atom decreases , bond angle decreases down the group

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