Nitre is

Which of the following is a component of baking powder?

Which metal bicarbonates do not exist in the solid state?
$(i) \, LiHCO_3$
$(ii) \, Ca(HCO_3)_2$
$(iii) \, Zn(HCO_3)_2$
$(iv) \, AgHCO_3$

Crude sodium chloride obtained by crystallisation of brine solution does not contain

Starting with sodium chloride,how would you proceed to prepare:
$(i)$ sodium metal
$(ii)$ sodium hydroxide
$(iii)$ sodium peroxide
$(iv)$ sodium carbonate?

On heating to $400-500\,^oC$,relatively unstable hydrides and carbonates decompose. Which of the following will decompose when heated to $400-500\,^oC$ ?
$(I) \ LiH$ $ $ $(II) \ NaH$ $ $ $(III) \ Li_2CO_3$ $ $ $(IV) \ Na_2CO_3$