ICSE 2007 : SCIENCE Paper 2 (Chemistry) - Question 7 (b) Identify the anion.

SCIENCE
Paper 2 (Chemistry) - 2007
(One hour and a half)

Question 7
(b) 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 answer in the format given below:-

Salt	Anion
A	(i)
B	(ii)
C	(iii)
D	(iv)
E	(v)

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1.
(i) When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.

2.
(ii) Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate paper black.

3.
(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.

4.
(iv) When dilute sulphuric acid is added to D a gas is produced which turns acidified potassium dichromate solution from orange to green.

5.
(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.

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