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Q.

Boiling point is highest for

A=NH3, B= PH3, C=AsH3, D= SbH3 

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a

C

b

B

c

A

d

D

answer is D.

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Detailed Solution

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H- bonding capacity order : NH3 > PH3 > AsH3 > SbH3 > BiH3

Central atom electro negativity order : NH3 > PH3 > AsH3 > SbH3 > BiH3

S-character percentage at central atom order : NH3 > PH3 > AsH3 > SbH3 > BiH3

Melting point order :  PH3 < AsH3  < SbH3  < NH3

Boiling point order : PH3 < AsH3 <NH3  < SbH3 

Vapourisation order : PH3 > AsH3 > SbH3 > NH3 

Enthalpy of vapourisation :  PH3 < AsH3  < SbH3  < NH3

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