NDA 2016 Chemistry question

Which one of the following has different number of molecules ? (All are kept at normal temperature and pressure)

Answer: (D)

Solution

Number of moles = mass / molar mass. 3 g of = 3/2 = 1.5 mol; 48 g of = 48/32 = 1.5 mol; 42 g of = 42/28 = 1.5

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Question ID VK-030556