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Q.

For the following Assertion and Reason, the correct option is 
Assertion (A) : PH3 has lower boiling point than NH3. 
Reason (R) : In liquid state NH3 molecules are associated through vanderwaal’s forces, but PH3 molecules are associated through hydrogen bonding. 
In the light of the above statements, choose the correct answer from the option given below.

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a

A is correct but R is not correct

b

A is not correct but R is correct

c

Both A and R are correct but R is not the correct explanation of A

d

Both A and R are correct and R is correct explanation of A

answer is C.

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Detailed Solution

Unlike NH3,PH3 molecules are not associated through hydrogen bonding in liquid state. That is why the boiling of PH3 is lower than NH3

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For the following Assertion and Reason, the correct option is Assertion (A) : PH3 has lower boiling point than NH3. Reason (R) : In liquid state NH3 molecules are associated through vanderwaal’s forces, but PH3 molecules are associated through hydrogen bonding. In the light of the above statements, choose the correct answer from the option given below.