Question 28

One of the phosphorus compound is popularly used as rat poison. The oxidation number of the phosphorus in this compound is

Solution

The rat poison is zinc phosphide, $$\text{Zn}_3\text{P}_2$$. With zinc at $$+2$$, $$3(+2) + 2x = 0$$, so phosphorus has oxidation number $$-3$$.

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