Statement (I) : p^K_^aof NH₃ > p^K_^a of PH₃
Statement (II) : N-H bond is less polar than P-H bond

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Both (I) & (II) are True

(I) is true & (II) is false

(I) is false & (II) is True

Both (I) & (II) are false

answer is B.

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Detailed Solution

Acidic strength in Hydrides of any group is explained on the basis of X-H bond enthalpy but not on the basis of X-H bond polarity.

EN of H(2.1) ; EN of N(3.0) ; EN of P(2.5)

N - H bond is more polar than P-H bond

N - H bond enthalpy is more than P - H bond enthalpy

$∴$ NH₃ is a weaker acid (lesser K_a & higher p^K_^aas compared to PH₃)

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