N₂O

NO$$_3^ - $$

NO

NO$$_2^ - $$

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)

ketoses, proteins

proteins, ketoses

aldoses, ketoses

ketoses, aldoses

Carius method is used for the estimation of nitrogen in an organic compound.

Kjeldahl's method is used for the estimation of nitrogen in an organic compound.

Carius tube is used in the estimation of sulphur in an organic compound.

Phosphoric acid produced on oxidation of phosphorus present in an organic compound is precipitated as Mg₂P₂O₇ by adding magnesia mixture.