Question

Which statements about conductivity of distilled water are correct?
(The question has multiple correct options)
(A) It possesses almost non-conducting nature.
(B) It is obtained by distillation of water several times.
(C) It is contaminated with little acid.
(D) None of the above.

Answer 1

In the above question, we are provided with conductivity details of distilled water. We have to choose the correct options from the given statements. Distilled water is a kind of purified water. Conductivity of a material depends upon the amount of ions present. Hence, with increase in impurities such as magnesium, calcium etc., the conductivity of water increases.

Complete answer:
Distilled water is a purified water that has been boiled into vapour and then gets condensed back into liquid in a separate container. Impurities present in the original water which do not boil below or near the boiling point of water remain in the previous container where the water was evaporated.
Pure water is not a good conductor of electricity. The conductivity of the water increases as the concentration of impurities (ions) increases. Hence, in order to get the correct value of conductivity, the water is distilled several times to get rid of impurities.
As distilled water is almost non-conducting and is obtained by repeated distillation.
Hence, we can say that option A and B are correct.

Note:
-Distilled water is not preferred as distillation removes all minerals from water. This results in demineralised water, which is not healthier than normal drinking water.
-When distilled water is added to an aquarium after considering that it does not have any known and unknown non-volatile contaminants, it removes essential minerals. Living organisms require specific minerals, and hence adding distilled water to an ecosystem, such as an aquarium, would reduce the concentration of these minerals. Fish and other living things that have evolved to survive in lakes and oceans should be expected to thrive at mineral ranges found in their original habitat.