The chief constituents of steel made in India are

The reagent used for toning in photography is

The green colour produced in the borax bead test of a chromium$(III)$ salt is due to formation of . . . . . . :

Among the following,the compound that is both paramagnetic and coloured is

Calomel is the name of

Generally,metal ions and their salts are coloured due to the presence of unpaired electrons in the metal ions. Which of the following compounds is coloured?