Question

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.

1. When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
2. The addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black on paper.
3. When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
4. When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
5. The addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.

Answer 1

Salt	Anion
A	Chloride (Cl−)
B	Sulphide (S2−)
C	Nitrate \[\ce{(NO^-3)}\]
D	Sulphite \[\ce{(SO^{2−}3)}\]
E	Carbonate \[\ce{(CO^{2-}3)}\]