MCQ
The source of retinol $($vitamin $A)$ is:
- ALiver
- BKidney
- CFish oils
- ✓All the above
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| Gas | $\text{CO}_2$ | $\text{SO}_2$ | $\text{CH}_4$ | $\text{H}_2$ |
| Critical temp$./K$ | $304$ | $630$ | $190$ | $33$ |

$\mathrm{N}_{2}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{g})$
the correct option is