A student took four test-tubes containing solutions of different colours marked I, II, III and IV as shown here. The test-tubes containing copper sulphate solution and ferrous sulphate solution could be the tubes:
| (1) II and III | (2) II and III |
| (3) III and IV | (4) II and IV |
"
Correct answer: (4) II and IV
Explanation: The copper sulphate solution is of blue colour and iron sulphate is of pale green colour.
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