Which of the following is most volatile?
Options:
NH3
PH3
AsH3
SbH3

Dear student,

‚ÄčThe Volatility of the hydrides of group 15 elements depends upon the strength of the hydrogen bond formed by them. Strength of hydrogen bond depends upon the electronegativity of the elements bonded to the hydrogen.
Electronegativity decreases down the group.
Therefore, 
Volatility increases as,
NH3<PH3<AsH3<SbH3

Regards
 

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