Q.

Correct decreasing order  of volatile character is

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a

PH3 > AsH3 > SbH3>NH3 >BiH3

b

BiH3> NH3 > SbH3 >  AsH3 > PH3

c

PH3 > AsH3 >BiH3>NH3> SbH3

d

PH3 > AsH3>NH3> SbH3 >BiH3

answer is D.

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Detailed Solution

Down the group as the size of the molecule increases , Vanderwaals forces become strongerand BP increasesSo in 15th group the expected BP isNH3NH3< SbH3 AsH3>NH3> SbH3 >BiH3
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