JEE Main Chemistry question

If two compounds have the same empirical formula but different molecular formulae, they must have [RPET 2008]

(A)Different percentage composition
(B)Different molecular weightsCorrect
(C)Same viscosity
(D)Same vapour density

Answer: (B)

Solution

Since molecular formula (empirical formula), and the two compounds differ in , their molecular weights (which equal empirical formula weight) must differ, even though

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Question ID VK-130509