Practical Chemistry — Question 5

Question 1(2007)

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in each salt.

(i) When AgNO₃ solution is added to a soln. of A, a white precipitate, insoluble in dilute nitric acid, is formed.

(ii) Addition of dil. HCl to B produces a gas which turns lead acetate paper black.

(iii) When a freshly prepared solution of FeSO₄ is added to a soln. of C and conc. H₂SO₄ is gently poured from the side of the test-tube, a brown ring is formed.

(iv) When dil. H₂SO₄ is added to D a gas is produced which turns acidified K₂Cr₂O₇ soln. from orange to green.

(v) Addition of dil. HCl to E produced an effervescence. The gas produced turns limewater milky but does not effect acidified K₂Cr₂O₇ soln.