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Which of the following is the correct or...

Which of the following is the correct order of increasing enthalpy of vaporisation ?

A

`NH_(3),PH_(3),AsH_(3)`

B

`AsH_(3),PH_(3),NH_(3)`

C

`NH_(3),AsH_(3),PH_(3)`

D

`PH_(3),AsH_(3),NH_(3)`

Text Solution

Verified by Experts

The correct Answer is:
D
Enthalpy of vaporisation increases, with increases in molecular mass. However, `NH_(3)` has exceptionally high enthalpy of vaporisation due to intermolecular H-bonding. Therefore correct order is
`PH_(3) gt AsH_(3) gt NH_(3)`
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