Water is often treated with chlorine,because it

Which of the following is not a water absorber and dehydrating substance?

Assertion $(A)$ : $NaCl$ is less soluble in heavy water than in ordinary water.
Reason $(R)$ : Dielectric constant of ordinary water is more than that of heavy water.
The correct answer is

The numbers of protons,electrons and neutrons in a molecule of heavy water are respectively

When $SO_3$ is treated with heavy water,the product is:

How many hydrogen-bonded water molecule$(s)$ are associated in $CuSO_{4} \cdot 5H_{2}O$?