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Q.

Higher boiling point of H2S compared to PH3 is best explained by 

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a

Stronger dipole - dipole attractions in H2S as compared to PH3

b

Stronger S-H bond enthalpy in H2S as compared to P-H bond enthalpy in PH3

c

Larger size of sulphur as compared to phosphorous

d

Higher molar mass of H2S as compared to PH3

answer is A.

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Detailed Solution

Molar mass of H2S = PH3 = 34 g/mole.

Sulphur is more electronegative than phosphorous.

Dipole moment of H2S > Dipole moment of PH3.

Dipole - dipole attractions in H2S are stronger as compared to PH3.

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