A) 75% ortho - hydrogen + 25% para- hydrogen
B) 25% ortho - hydrogen + 75% para- hydrogen
C) 50% ortho - hydrogen + 50% para - hydrogen
D) 1% ortho - hydrogen + 99% para-hydrogen
E) None of the above
Correct Answer: A
Solution :
At room temperature, ordinary dihydroeen contains 75% of ortho hydrogen and 25% of para hydrogen. As the temperature is lowered the percentage of ortho hydrogen in the mixture decreases while that of the para hydrogen increases.
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