The molecular formula of a compound is $C_{2} X_{6}$ . X is unknown. If the mass ratio of C to X is 4:1 in the compound, find X.

Helium

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Sodium

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Calcium

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Hydrogen

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Solution

The correct option is D
Hydrogen

Let the mass of the element X be $x$

Since, the mass ratio $= \frac{2 \times 12}{6 \times x} = \frac{4}{1}$ , $x = 1$

Hence, X is Hydrogen.

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