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JEE Main levelSingle correct optionDifficulty 2 of 3bn084

Which is the formula of sodium hexafluorosilicate?

A $Na [SiF X_{6}]$
B $Na X_{2} [SiF X_{6}]$
C $Na X_{4} [SiF X_{6}]$
D $Na X_{2} [SiF X_{4}]$

Answer: B

Si is

+ 4

and six F

^{-}

contribute

- 6

, so the complex ion is

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

. Two

Na X^{+}

are needed:

Na X_{2} [SiF X_{6}]

.

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