If two compounds have the same empirical formula but different molecular formula, they must have :

different percentage composition

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different molecular weights

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same vapour density

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none of these

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Solution

The correct option is B different molecular weights
If two compounds have the same empirical formula but different molecular formula, they must have different molecular weights.

For example, $C H_{2} O$ and $C_{6} H_{12} O_{6}$ have the same empirical formula but different molecular formula, they have different molecular weights.

Option B is correct.

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Similar questions

Q. STATEMENT-1: Two compounds cannot have the same empirical formula.

STATEMENT-2: Compounds that have the same empirical formula may have different molecular formulae.

Q. Compounds which have same molecular formula but different structural formula is called:

Q. Compounds having the same molecular formula but different structures are called:

Give examples of compounds whose
(a) empirical formula is the same as the molecular formula.
(b) empirical formula is different from the molecular formula.

Two or more compounds having the same molecular formula but different functional groups are called:

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