Potassium is kept in

Which of the following compounds transforms baking soda into baking powder?

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.

What happens when : $(i)$ sodium metal is dropped in water? $(ii)$ sodium metal is heated in free supply of air? $(iii)$ sodium peroxide dissolves in water?

The stability order of oxide,peroxide,and superoxide of alkali metals is:

The compound formed on heating sodium metal in a current of dry ammonia gas is