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Which of the following has highest boiling point?

Option: 1

NH3


Option: 2

PH3


Option: 3

AsH3


Option: 4

SbH3


Answers (1)

best_answer

As we have learnt,

The boiling points increase with increase in molecular weights, due to the increase in Van der Waal's forces with molecular mass.

SbH3 has higher molecular weight and hence it has the greatest boiling point among the Group 15 hydrides.

It is to be noted that NH3 has an abnormally large value of Boiling point due to Hydrogen bonding, but it is not greater than SbH3.

So, SbH3 has higher boiling point than PH3, AsH3  and NH3.

Therefore,option (4) is correct.

Posted by

vinayak

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