Question

Ordinary hydrogen at room temperature is a mixture of_________.

• A. $75\%$ $o$-Hydrogen + $25\%$ $p$-Hydrogen
• B. $25\%$ $o$-Hydrogen + $75\%$ $p$-Hydrogen
• C. $50\%$ $o$-Hydrogen + $50\%$ $p$-Hydrogen
• D. $1\%$ $o$-Hydrogen + $99\%$ $p$-Hydrogen

Answer 1

The correct option is A $75\%$ $o$-Hydrogen + $25\%$ $p$-Hydrogen

At room temperature, the ordinary hydrogen is an equilibrium mixture of 75% ortho hydrogen and 25% para hydrogen.In ortho hydrogen, the spins of two protons are in the same direction whereas in para hydrogen, the spins of two protons are in the opposite direction.