When Kl is added to acidified solution fo sodium nitrite,

When KI is added to an acidified solution of sodium nitrite

When KI is added to acidified solution of solution of sodium nitrite :

When KI is added to acidified solution of solution of sodium nitrite :

When Al is added to sodium hydroxide solution:

When Al is added to sodium hydroxide solution:

What will happen when KI is added to acidified KMnO_4 solution.

Aqueous solution of nickel sulphate on treating with pyridine and then adding a solution of sodium nitrite gives derk blue crystals of