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Question

When decomposed, 36 gm of H2O gives _______ g of hydrogen and ____ g of oxygen.


A

30 gm of oxygen and 4 gm of hydrogen

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B

16 gm of oxygen and 18 gm of hydrogen

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C

32 gm of oxygen and 2 grams of hydrogen

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D

3.78 gm H2 and 30.22 gm O2.

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Solution

The correct option is D

3.78 gm H2 and 30.22 gm O2.



2H2O 2H2 + O2

2 mole 2 mole 1 mole

2 mole of water weighs 36 g.

2 mole of H2 weighs 4 g

1 mole of O2 weighs 32 g

Hence, 36 g of H2O gives 4 g H2 and 32 g O2.


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