Physical Properties of Group 1 Elements

Metal $\left(\mathrm{M}\right)$ shows crimson red colour in flame test and its halide is deliquescent then metal $\left(\mathrm{M}\right)$ could be:

Select correct statement(s):

Which of the following statement(s) is/are true?

Which of the following statement is incorrect?

The hydration energy of ${\mathrm{Mg}}^{2+}$ ion is higher than that of:

Select the correct statement with respect to alkali metals.

Among $\mathrm{LiCl}, \mathrm{RbCl}, {\mathrm{BeCl}}_2$ and ${\mathrm{MgCl}}_2$ the compound with greatest and least ionic character respectively are _______.

Alkali metals are not characterised by:

Which of the following statements about the solution of alkali metals in liquid ammonia is correct?

Comment on the mobilities of the alkali metal ions in aqueous solution are  ${\mathrm{Li}}^{+} < {\mathrm{Na}}^{+}< {\mathrm{K}}^{+} < {\mathrm{Rb}}^{+} < {\mathrm{Cs}}^{+}$.