Select the incorrect statement(s):

• A

  $\text{ Lattice energy }\propto \frac{1}{r^2}.\left\{\text{ where }r\text{ is the interionic distance }\right\}$

• B

  $\text{ Lattice energy }\propto q_1{q}_2\text{. {where }{q}_1\text{ and }{q}_2\text{ are the charges of co-ions }\}$

• C

  Ionic mobility of the ions in aqueous state $\propto \frac{1}{\text{ radius of ions in gaseous state }}$

• D

  Heat of formation of a compound depends on the number of steps involved in its formation reaction