The valencies of sulphide ion and phosphide ion are and respectively.

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Solution

Sulphide ion, $S^{2 -}$ has -2 charge on it, so its valency is 2.
Similarly, phosphide ion, $P^{3 -}$ has -3 charge on it, so its valency is 3.

Hence, the correct option is (a).

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The valencies of sulphide ion and phosphide ion are ____ and ____ respectively.

Sulphide ion, S2− has -2 charge on it, so its valency is 2. Similarly, phosphide ion, P3− has -3 charge on it, so its valency is 3. Hence, the correct option is (a).

The valencies of sulphide ion and phosphide ion are and respectively.

Sulphide ion, $S^{2 -}$ has -2 charge on it, so its valency is 2.
Similarly, phosphide ion, $P^{3 -}$ has -3 charge on it, so its valency is 3.

Hence, the correct option is (a).