MCQ
An element with variable $($more than one$)$ valency stored under water is:
- ASilicon.
- BIron.
- ✓Phosphorus.
- DGold.
✓
Answer
Correct option: C.
Phosphorus.
Phosphorous can accept either $3$ electrons or donate $5$ electrons depending on the neighborhood element. Hence, it has variable valency. The allotropic form of phosphorus $($white phosphorus$)$ is less stable and therefore highly reactive because of angular strain in $P_4$ molecule where the angles are only $60^\circ .$
It readily catches fire in air to give dense white fumes of $\ce{P_4O_{10}}$. Therefore, it is kept in water to avoid oxidation by the oxygen present in the air. It is kept in water because it is insoluble in water.
It readily catches fire in air to give dense white fumes of $\ce{P_4O_{10}}$. Therefore, it is kept in water to avoid oxidation by the oxygen present in the air. It is kept in water because it is insoluble in water.
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