The molecular formula of the compound formed by calcium and fluorine is:

C a F

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C a F_{2}

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C a F_{3}

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C a_{2} F_{3}

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Solution

The correct option is D $C a F_{2}$
Calcium has a valency of $+ 2$ and Fluorine has a valency equal to $- 1$ .
Cation $\to C a^{+ 2}$ and anion $\to F^{-}$ . Hence, the molecular formula is $C a F_{2}$ .

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Question 15
Give the formulae of the compounds formed from the following sets of elements

(a) Calcium and fluorine
(b) Hydrogen and sulphur
(c) Nitrogen and hydrogen
(d) Carbon and chlorine
(e) Sodium and oxygen
(f) Carbon and oxygen

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