The reaction of nitrogen dioxide gas with ozone produces which of the following gases?

Ammonia gas is dried by using ...........

Of the following compounds, the most acidic is:

In the following reaction,identify the nature of the products formed by the complete hydrolysis of $\underline{P}_4O_8$ at $R.T$:
$\underline{P}_4O_8 + H_2O \longrightarrow H_3PO_3 + H_3PO_4$

Consider the following Assertion $(A)$: Phosphorus can form both phosphorus$(III)$ and phosphorus$(V)$ chlorides, but nitrogen cannot form nitrogen$(V)$ chloride. Reason $(R)$: The electronegativity of nitrogen is more than that of phosphorus. The correct answer is

When bauxite powder is mixed with coke and heated with nitrogen at $2075 \ K$,carbon monoxide and $x$ are formed. Which gas is produced when $x$ reacts with water?