Question

what is valency of sulphate

Answer 1

Count how many hydrogen atoms are in the formula. This is the valency of the radical. For example, H2SO4 has two hydrogen atoms, so the valency of sulfate is two. ... Aluminum makes ions with a positive charge, which is why the sulfate ion has a negative charge, and that makes the sulfateradical have a 2- valency.

Answer 2

The valency of sulphate is-2 [i.e SO4 .(-2)]. I hope ,it helps you.