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Question

If 100 ml hydrogen chloride is completely decomposed, the volume of H2 formed will be at STP:

A
20 ml
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B
200 ml
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C
100 ml
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D
50 ml
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Solution

The correct option is D 50 ml
The reaction is 2HClH2+Cl2

2 moles of HCl gives one mole of hydrogen.

At STP, 1 mole of any gas occupies 22.4 L.

Thus, 44.8 L of HCl gives 22.4 L of hydrogen.

When 100 ml of hydrogen chloride is completely decomposed, the volume of hydrogen formed is 100×22.444.8=50 ml.

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