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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn047

Diammonium hexafluoridosilicate is $(NH X_{4}) X_{2} [SiF X_{6}]$ (H is $+ 1$ , F is $- 1$ ). What is the SUM of the oxidation numbers of all nitrogen and silicon atoms in one formula unit?

A $- 2$
B $+ 4$
C $- 6$
D $+ 10$

Answer: A

In

NH X_{4} X^{+}

:

x + 4 = + 1

gives N

= - 3

, so two N give

- 6

. In

[SiF X_{6}] X^{2 -}

:

x - 6 = - 2

gives Si

= + 4

. Sum

= - 6 + 4 = - 2

.

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