Which ion gives a blue colour in aqueous solution?

The green colour of the compound nickel(II) chloride is due to:

Potassium permanganate (KMnO₄) has which colour?

The yellow colour of chromates (CrO₄²⁻) is due to:

Ferric chloride (FeCl₃) solution appears:

The brown colour of bromine water is due to:

Which gas is reddish-brown in colour?

Copper sulphate crystals are blue because they contain:

The green colour of chlorine gas is due to its:

Which compound is responsible for the deep blue colour in the starch–iodine test?