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The salts which make water hard are...

The salts which make water hard are

A

calcium and magnesium sulphates

B

calcium and magnesium chlorides

C

calcium and magnesium bicarbonates

D

any of the above

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The correct Answer is:
D
any of the above
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CPC CAMBRIDGE PUBLICATION-CPC MODEL QUESTION PAPER -3-ANSWER THE FOLLOWING QUESTIONS
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  11. Draw the diagram of the apparatus used in the electrolysis of water.

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  12. Write the difference between metals and non metals on the basis of che...

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