First slide

Hydrogen

Question

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

Easy

A

1 : 3
B

2 : 3
C

3 : 1
D

1 : 1

Solution

At normal conditions ortho and para hydrogens are in equilibrium
$\large O-H \rightleftharpoons P-H$
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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