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At room temperature the ratio of ortho and para hydrogens in dihydrogen is

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1 : 3

2 : 3

3 : 1

1 : 1

answer is C.

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Detailed Solution

At normal conditions ortho and para hydrogens are in equilibrium

Temp	% of "O-H"	% of Para-H
RT	75%	25%
OK	0%	100%

→ Ordinary Hydrogen under atmospheric conditions contains 75%[3] ortho and 25% para form.

→ At OK [very low temperature] hydrogen gas contains only 100% of para form.

i.e., At OK (or) very low temp. equilibrium moves towards para side that means O-H converted into para-H at OK.

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