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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cb164

Which of the following comparisons of dipole moment is/are correct?

A $NH X_{3} > NF X_{3}$
B $H X_{2} O > H X_{2} S$
C $HF > HCl$
D $PH X_{3} > NH X_{3}$

Answer: A, B, C

(A) In

NH X_{3}

the bond and lone-pair dipoles add, while in

NF X_{3}

they oppose. (B)

H X_{2} O

(1.85 D)

>

H X_{2} S

(about 0.97 D). (C) HF (1.91 D)

>

HCl (1.08 D). (D) is false because

NH X_{3}

(1.47 D)

>

PH X_{3}

(about 0.58 D).

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