When copper is heated with conc. ${\mathrm{HNO}}_{\mathrm{3}}$, it produces ______.

Brown ring test is used for the detection of which radical?

Nitrogen dioxide is released by heating_____.

Which oxide is colourless and neutral?

In which substance does nitrogen exhibit the lowest oxidation state?

Which of the following oxide of nitrogen has lowest oxidation number of nitrogen?

The oxidation state of nitrogen in ${\mathrm{N}}_{\mathrm{2}}{\mathrm{O}}_{\mathrm{4}}$ is _____.

The nitrogen oxide$\left(\mathrm{s}\right)$ that contain$\left(\mathrm{s}\right)$ $\mathrm{N}-\mathrm{N}$ bond$\left(\mathrm{s}\right)$ is$/$are _____.

Atoms in a ${\mathrm{P}}_{\mathrm{4}}$ molecule of white phosphorus are arranged regularly in space in which of the following way?