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JEE Main levelSingle correct optionDifficulty 2 of 3cb008

The total number of coordinate (dative) covalent bonds in one formula unit of $NH X_{4} BF X_{4}$ (i.e. $NH X_{4} X^{+}$ together with $BF X_{4} X^{-}$ ) is

A $0$
B $1$
C $2$
D $3$

Answer: C

In

NH X_{4} X^{+}

one N-H bond arises from the lone pair of

NH X_{3}

donated to

H X^{+}

. In

BF X_{4} X^{-}

one B-F bond arises from

F X^{-}

donating a pair to

BF X_{3}

. Total = 1 + 1 = 2.

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