From the substances — Ammonium sulphate, Lead carbonate, Chlorine, Copper nitrate, Iron [II] sulphate — State : A compound which on heating with NaOH produces a gas which forms dense white fumes with HCl.

Select from the list — Ammonia, Copper oxide, Copper sulphate, Hydrogen chloride, Hydrogen sulphide, Lead bromide : The compound which is not a metal hydroxide but it's aqueous solution is alkaline in nature.

Name the ion other than ammonium ion formed when ammonia dissolves in water.

Write an equation for the reaction of chlorine with excess of ammonia.