The structural formula of hypophosphorus acid is

Small quantities of $NO$ and $HNO_3$ are formed as impurities when $N_2$ is prepared from $NH_4Cl_{(aq)}$ and $NaNO_{2(aq)}$. These impurities can be removed by passing the $N_2$ gas through which of the following?

When orthophosphoric acid is heated to $600\,^{\circ}C,$ the product formed is

Discuss the variations in atomic and ionic radii of elements,the trends in ionisation enthalpies and electronegativity of group-$15$ elements.

Pure $HNO_3$ is a colorless liquid,but it turns light brown in the presence of light. This is due to its decomposition into which of the following substances in small amounts?

What is the active species in Nessler's reagent used for the identification of ammonia?