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Question

Molarity of pure D2O will be (assume density of D2O is 1 g mL−1)

A
55.56 M
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B
18 M
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C
20 M
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D
50 M
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Solution

The correct option is D 50 M
Molarity =No. of molesVolume of solution
Let, volume of the solution be 1 litre
Given, density of D2O is 1 g mL1
So, 1 litre of solution contains 1000 g solution.

No. of moles=Total massMolar mass=100020=50 mol
Molarity=50 mol1 litre=50 M

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