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Q.

What is the valency of phosphate ions in Al (PO4)?

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a

5

b

3

c

2

d

4

answer is C.

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Detailed Solution

Valency is the number of electrons it requires to achieve a stable octet configuration. If the last shell contains more than 4 electrons, it gains an electron, otherwise, it loses an electron due to stability.

Valency can be calculated from electronic configurations. 

In the given compound Al (PO4), the metal ion is the aluminum ion (Al3+) and the valency of Al is 3. Now, as the compound is a neutral compound, the charge carried by the cation is equal to the charge carried by the anion.

The anion in the compound is a phosphate ion and thus, the anion is PO43-. Therefore, the valency of phosphate ion is 3.

Hence, the correct option is (C).

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