Which of the following is arranged in the increasing order of enthalpy of vaporization?

Question

Which of the following is arranged in the increasing order of enthalpy of vaporization? (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

Tardigrade Admin · Accepted Answer

The order of heat of vaporisation or boiling point of the following hydrides of VA group elements is

N H_{3} > B i H_{3} > S b H_{3} > A s H_{3} > P H_{3}

Boiling point increase with increase in molecular mass hence, boiling point of

B i H_{3}

should be maximum and that of

N H_{3}

should be minimum. But

N H_{3}

has highest boiling point because of

H

-bond present in

N H_{3}

.

Q. Which of the following is arranged in the increasing order of enthalpy of vaporization?

$N H_{3}, P H_{3}, A s H_{3}$

$A s H_{3}, P H_{3}, N H_{3}$

$N H_{3}, A s H_{3}, P H_{3}$

$P H_{3}, A s H_{3}, N H_{3}$

Q. Which of the following is arranged in the increasing order of enthalpy of vaporization?

NH3​,PH3​,AsH3​

AsH3​,PH3​,NH3​

NH3​,AsH3​,PH3​

PH3​,AsH3​,NH3​

$N H_{3}, P H_{3}, A s H_{3}$

$A s H_{3}, P H_{3}, N H_{3}$

$N H_{3}, A s H_{3}, P H_{3}$

$P H_{3}, A s H_{3}, N H_{3}$