# What is the formula of cryolite?(a) $N{{a}_{3}}Al{{F}_{10}}$(b) $N{{a}_{3}}Al{{F}_{6}}$(c) $N{{a}_{3}}Al{{F}_{8}}$(d) $N{{a}_{3}}Al{{F}_{7}}$

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Hint: Cryolite consists of sodium, fluorine and aluminum. In cryolite, the oxidation state of sodium is $+3$ , fluorine is $-6$ and aluminum is $+3$ . Now with the help of this you can easily identify the chemical formula of the cryolite.

The chemical formula of cryolite is $N{{a}_{3}}Al{{F}_{6}}$ and therefore, commonly, cryolite is also known as sodium hexafluoro aluminate .
So, thus the formula of cryolite is $N{{a}_{3}}Al{{F}_{6}}$.