What is used to soften water by the Clark's method?

Temporary hardness may be removed from water by adding

How many hydrogen atoms are surrounding each oxygen atom in the structure of ice?

Why is water used as a medium for chemical reactions?

Which of the following can effectively remove all types of hardness of water?

The $INCORRECT$ statement$(s)$ about heavy water is (are):
$(A)$ Used as a moderator in nuclear reactor.
$(B)$ Obtained as a by-product in fertilizer industry.
$(C)$ Used for the study of reaction mechanism.
$(D)$ Has a higher dielectric constant than water.
Choose the correct answer from the options given below: