Question

In a locality, hard water, required for an experiment, is not available. However, the following salts are available in the school laboratory:1. Sodium sulphate2. Calcium sulphate3. Magnesium chloride4. Sodium chloride5. Calcium chloride6. Potassium sulphateWhich of the above salts may be dissolved in water to obtain hard water for the experiment?(A) 2, 3 and 5(B) 1, 2 and 5(C) 1, 2, 4 and 6(D) 3 and 5 only

Answer 1

your answer is (A) 2 , 3 and 5

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Answer 2

the answer is (b)

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