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

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Both (I) & (II) are True

(I) is true & (II) is false

(I) is false & (II) is True

Both (I) & (II) are false

answer is A.

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Detailed Solution

Bond angle in 15th group hydridesNH3 (107.8o) > PH3(93.6o) > AsH3(91.8o)> SbH3(91.3o)Bent rule:Let us compare NH3 and SbH3,Central atom contains a lone pair on both of themEN 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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