Identify the anion present in the salt on the basis of the reaction given below

When a freshly prepared solution of ferrous sulphate is added to a salt solution and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.

Q. 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. Tabulate your answers in the format given below:
(i) When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.
(iii) 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.
(iv) When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
(v) Addition of dilute hydrochloric acid to E produces an effervescence. The gas produced turns limewater milky but does not affect acidified potassium dichromate solution.

Salt	Anion
A
B
C
D
E

Q.

Identify the anion present in the salt on the basis of the reaction given below:

When silver nitrate solution is added to a salt solution, a white precipitate, insoluble in dilute nitric acid, is formed.

Q. Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?

Q.

Identify the anion present in the salt on the basis of the reaction given below

When dilute sulphuric acid is added to salt solution, a gas is produced which turns acidified potassium dichromate solution from orange to green.

Q. (a) Explain with the help of a balanced equation the brown ring test for nitric acid.
(b) Why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test? [5 MARKS]