Assertion (A): | When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. |
Reason (R): | The equilibrium constant of Cu2+(aq) + S2- (aq) ⇋ CuS(s) is high because the solubility product is low. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A) |
2. | Both (A) and (R) are False. |
3. | (A) is True but (R) is False. |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A) |