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Q.

The number of moles of oxygen obtained by the electrolytic decomposition of 108 g water is

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a

2.5

b

3

c

5

d

7.5

answer is B.

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Detailed Solution

2H2O2 mole  ⟶ electrolysis 2 H2+O22×18−36g∵  36g of H2O produce 1 mole of oxygen ∴ 108 g of water will produce oxygen =10836=3mol.
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