The minimum temperature required for a non-catalytic reaction between $N_2$ and $O_2$ is (in $K$)

$A$ mixture of ammonia and air at about $800\,^{\circ}C$ in the presence of $Pt$ gauze forms:

The temperature required for electrolysis is maximum for which of the following hydrides?

Which among the following group $15$ elements does not exhibit allotropy?

State the oxoacids of phosphorus with their formula,methods of preparation,and the presence of characteristic bonds in their structure.

Assertion $(A)$: $P_4O_{10}$ cannot be used to remove moisture from ammonia gas. Reason $(R)$: $P_4O_{10}$ reacts with $NH_3$ gas. The correct answer is: