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JEE Advanced levelSingle correct optionDifficulty 3 of 3cb033

Among $NH X_{3}$ , $H X_{2} O$ , $PH X_{3}$ , $SO X_{2}$ , $BF X_{3}$ , $CH X_{4}$ and $H X_{2} S$ , the number of species with a bond angle smaller than the tetrahedral angle ( $109. 5^{\circ}$ ) is

A $3$
B $4$
C $5$
D $6$

Answer: B

NH X_{3}

(about 107),

H X_{2} O

(about 104.5),

PH X_{3}

(about 93) and

H X_{2} S

(about 92) are all smaller than 109.5.

CH X_{4}

equals it,

SO X_{2}

(about 119) and

BF X_{3}

(120) are larger. The count is 4.

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