Zinc oxide when treated with $NaOH$ solution gives

What is Soda ash?

$Ca + 2C$ $\rightarrow CaC_2$ $\xrightarrow{N_2, \Delta} A$
Compound $(A)$ is used as a/an:

Assertion : Magnesium continues to burn in nitric oxide.
Reason : During burning heat evolved does not decompose $NO$.

The white precipitate $(Y)$,obtained on passing a colourless and odourless gas $(X)$ through an ammoniacal solution of $NaCl$,loses about $37 \%$ of its weight on heating and a white residue $(Z)$ of basic nature is left. Identify $(X)$,$(Y)$,and $(Z)$ from the following sets.

Which of the following statements about $Na_2O_2$ is not correct?