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

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NH₃,AsH₃,PH₃

PH₃,AsH₃,NH₃

NH₃,PH₃,AsH₃

AsH₃,PH₃,NH₃

answer is D.

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Detailed Solution

enthalpy of vapourization $\infty$ strength of inter molecular forces

In NH₃ hydrogen bond is present stronger inter molecular forces

In PH₃ and AsH₃ intermolecular forces are dipole - dipole attractions and due to larger size AsH₃ is having stronger intermolecular force of attractions

increasing order of strength of intermolecular attractions is PH₃ < AsH₃ < NH₃

increasing order of enthalpy of vapuoriztion is PH₃ < AsH₃ < NH₃

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