$NaNO_3$ on heating gives which gas?

Identify $X$ and $Y$,respectively in the following reactions:

Magnesium is burnt in the air to form $A$ and $B$. When $B$ is hydrolyzed,$C$ and $D$ are formed. $D$ is the reactant in the manufacture of nitric acid by Ostwald's process. What is $C$?

In the reaction $M + O_2 \to MO_2$ (superoxide),the metal $M$ is

Which of the following colours is developed when alkali metal is dissolved in liquid ammonia?

Which of the following is the most important factor in making lithium metal the strongest reducing agent?