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JEE Main levelOne or more correct optionsDifficulty 2 of 3mc211

A mixture contains He ( $M = 4$ ) and $CH X_{4}$ ( $M = 16$ ). Select the correct statement(s).

AA mixture of equal masses has an average molar mass of $6.4$ .
BA mixture of equal masses has an average molar mass of $10$ .
CAn equimolar mixture has an average molar mass of $10$ .
DAn equimolar mixture has a vapour density of $5$ .

Answer: A, C, D

Equimolar: M = (4 + 16)/2 = 10, so VD = 5. Equal masses (1 g each): moles = 1/4 + 1/16 = 0.3125, M = 2/0.3125 = 6.4, not 10.

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