Define polarization.

Magnesium cation $(Mg^{2+})$ has a polarising power close to that of:

Which of the following is/are soluble in ethanol?

Which of the following is least ionic?

Describe the law of Fajan's rule.

Which of the following statements are correct?
$(A)$ Both $LiCl$ and $MgCl_2$ are soluble in ethanol.
$(B)$ The oxides $Li_2O$ and $MgO$ combine with excess of oxygen to give superoxide.
$(C)$ $LiF$ is less soluble in water than other alkali metal fluorides.
$(D)$ $Li_2O$ is more soluble in water than other alkali metal oxides.
Choose the most appropriate answer from the options given below.