Question

name the following radical and give their valencies.
1) SO4,
2) CO3,
3)OH,
4)Cr207​

Answer 1

1. Sulphate. Valency= -2
2. Carbonate. Valency= -2
3. Hydroxyl (Hydroxide). Valency= +1
4. Chromate. Valency= -2

Answer 2

$answer \\ \\ 1)sulphate = -2\\ 2)carbonate = -2\\ 3)hydroxide = 1\\ 4) chromate= -2$