Among which of the following statements about molecular and the empirical formulae is/are false?
I . A given compound can have the same molecular and empirical formula
II . The molecular formula is a whole number multiple of the empirical formula
III . $H_{2} O_{2}$ represents the empirical formula of hydrogen peroxide

III only

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I and II only

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II and III only

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I, II, and III

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I only

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Solution

The correct option is C III only
The statement III about molecular and the empirical formulae is false.
I . A given compound can have the same molecular and empirical formula. For example, carbon monoxide $C O$ has the same molecular and empirical formula.
II . The molecular formula is a whole number multiple of the empirical formula. For example, the molecular formula and the empirical formula of ethane are $C_{2} H_{6}$ and $C H_{3}$ respectively. $C_{2} H_{6} = 2 \times C H_{3}$
III . $H_{2} O_{2}$ represents the molecular formula of hydrogen peroxide. Its empirical formula is $H O$ .

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