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Heavy Water

The percentag...

Question

The percentage of para – hydrogen in ordinary hydrogen Increases when

A

temperature is lowered

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B

temperature is increased

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C

pressure is increased and temperature decreased

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D

None of these

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Solution

The correct option is A temperature is lowered
Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen. (At room temperature about 75% of ortho and 25% para). At low temperature, the percentage of para hydrogen increases.

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