Statement (I) : Bond angle of H₂O> H₂S > H₂Se > H₂Te

Statement (II) : Down the group EN of cental atom decreases

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Both (I) & (II) are true

Both (I) & (II) are false

(I) is false & (II) is true

(I) is true & (II) is false

answer is A.

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Detailed Solution

In similar molecules of a group in which the central atom has lone pair , bond angle decreases

down the group as the E.N of central atom decreases

NH₃ > PH₃ > AsH₃ > SbH₃ > BiH₃

H₂O> H₂S > H₂Se > H₂Te > H₂Po

Consider H₂O and H₂Po

Bond pairs in H₂O are closer to Oxygen due to its higher E.N

So lone pair has lesser influence

Bond pairs in H₂Po are farther to Po due to its lesser E.N

So lone pair has greater influence

$\therefore$ Down the group from H₂O to H₂Po as E.N of central atom decreases

influence of lone pair increases, bond pairs come closer to each other ,

bond angle decreases

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