Excess of $Na^+$ ions in our system causes:

Which among the following elements develops noble gas configuration in $+1$ state?

Which of the following alkali metals is smallest in size?

Fill in the blanks:
$(1)$ $Li-Mg$ alloy is used to prepare ......
$(2)$ Colors of superoxides of alkali metals are ...... or ......
$(3)$ On combustion of lithium in the presence of air,it produces ...... and ......
$(4)$ On heating,lithium nitrate converts into ......

On heating 'Trona $(Na_2CO_3 \cdot NaHCO_3 \cdot 2H_2O)$' with the help of a Bunsen burner,we get . . . . . . as the solid residue.

The highly reactive alkali metals are kept in