Q.

Amongst NH3, PH3, AsH3 and SbH3 the one with highest boiling point is

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a

NH3 because of lower molecular weight

b

SbH3 because of higher molecular weight

c

PH3 because of H-bonding

d

AsH3 because of lower molecular weight

answer is B.

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Detailed Solution

As molecular weight increases, magnitude of Van der Waal's force of attraction increases.Therefore, boiling point increases. Though NH3 has strong H-bonding but boiling point of SbH3 is highest due to highest molecular weight. Boiling point of NH3=238.5 K and SbH3 = 254.6 K.
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Amongst NH3, PH3, AsH3 and SbH3 the one with highest boiling point is