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Question

2g of hydrogen will have same number of molecules as is present in:

A
14g of nitrogen
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B
32g of sulphur dioxide
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C
71g of chlorine
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D
24g of ozone
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Solution

The correct option is C 71g of chlorine
NA molecules are present in 1 mole of hydrogen i.e 1 g of hydrogen.
So, 2 g of hydrogen has 2 NA molecules
Similarly, 71 g of chlorine is (2×35.5 g) i.e 2 moles of chlorine.
So, 2 moles of chlorine will also have 2NA molecules.
On the other hand, 14 g of N has NA molecules
32 g of SO2 has NA/2 molecules
24 g of O3 has NA/2 molecules

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