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JEE Advanced levelSingle correct optionDifficulty 3 of 3bn151

A sodium salt is named sodium hexafluorosilicate. Which option gives its formula and the oxidation number of Si?

A $NaSiF X_{6}$ , $+ 5$
B $Na X_{2} SiF X_{6}$ , $+ 4$
C $Na X_{2} SiF X_{6}$ , $+ 2$
D $Na X_{4} SiF X_{6}$ , $+ 2$

Answer: B

Hexafluorosilicate is

SiF X_{6} X^{2 -}

, so two

Na X^{+}

are needed:

Na X_{2} SiF X_{6}

. With F

= - 1

:

x + 6 (- 1) = - 2

gives

x = + 4

.

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