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Most volatile hydride of VIA group is

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H₂O

H₂Se

H₂S

H₂Te

answer is A.

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Detailed Solution

From H₂O to H₂Po vanderwaal's forces of attractions increases .
B.P order must be
H₂O< H₂S < H₂Se < H₂Te

But due to association of H₂O molecules through intermolecular H- bonding it has abnormal B.P

Actual B.P order is: H₂S < H₂Se < H₂Te < H₂O

order of Volatility: H₂S > H₂Se > H₂Te > H₂O

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