Which of the following is a mixed anhydride?

Explain the nature of hydride compounds of group-$15$ elements. Explain the nature of oxide compounds of group-$15$ elements. Write a note on halide compounds of group-$15$ elements.

Which of the following oxides of nitrogen is coloured?

Write a note on $p$-block elements of the periodic table.

How can you synthesise nitric oxide in the laboratory?

An orange solid $(X)$ on heating,gives a colourless gas $(Y)$ and a green residue $(Z).$ Gas $(Y)$ on treatment with $Mg,$ produces a white solid substance. Identify the white solid substance.