The most soluble bicarbonate is

Four reactions are given below:
$(i)$ $2Li + 2H_2O \to 2LiOH + H_2$
$(ii)$ $2Na + 2H_2O \to 2NaOH + H_2$
$(iii)$ $2LiNO_3 \xrightarrow{\text{Heat}} 2LiNO_2 + O_2$
$(iv)$ $2NaNO_3 \xrightarrow{\text{Heat}} 2NaNO_2 + O_2$
Which of the above,if any,is wrong?

When sodium bicarbonate is heated strongly or calcined in a kiln,it forms:

Which one of the following nitrates will decompose to give $NO_2$ on heating?

The stability of the following alkali metal chlorides follows the order:

$KO_2$ (Potassium superoxide) is used in confined spaces and submarines because it