The softening of hard water by synthetic ion-exchange resins is based on -
1. Increasing the lattice energy.
2. Physical separation.
3. Lowering the activation energy.
4. Exchange of cations and anions.
The incorrect statement among the following options is:
1. K+ ions react with alkaline water and give K(OH)3
2. KCl is a salt of strong acid and strong base.
3. Al(OH)3 in alkaline condition gives [Al(OH)4]-
4. AlCl3 is a salt of strong acid and weak base.