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Which of the following statements is not correct?

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ortho- and para-dihydrogen are similar in chemical properties

At room temperature, ordinary hydrogen is a mixture of 7 5% ortho-dihydrogen and 25% para-dihydrogen.

At lower temperature, proportion of ortho-dihydrogen increases whereas that of para-dihydrogen decreases

it is not possible to isolate pure ortho-dihydrogen

answer is C.

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Detailed Solution

The ratio para/ortho dihydrogen increases with decrease in temperature and at room temperature this ratio is about 0.25.

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