Question

As the rain water is the purest form of water, this can be used in lab due to:
a.) Presence of ions
b.) Absence of ions
c.) Good smell
d.) Easy availability.

Answer 1

Hint: Try to recall that rainwater is the purest form of water as it is naturally a distilled water and there is not any dissolved content in it. Now by using this you can easily find the correct option from the given options.

Complete step by step solution:
It is known to you that rainwater is considered the purest form of water because it directly comes from the condensation of water droplets.
The water present in seas, rivers and lakes evaporates in the presence of sunlight and during the process of vaporisation, all impurities are removed and by rainfall, we get a very pure form of water.
Now, since rainwater is a natural distilled water which contains no minerals and it assures that experiment is accurate as it does not contain any ions or dissolved minerals
Impure water contains minerals and ions that can react with chemicals and can change chemical reactivity and density. So, the result will not be fair.
Therefore, from above we can conclude that option B is the correct option to the given question.

Note: It should be remembered that distilled water is the purest form of water and does not contain any impurities and is best suitable for experiments.
Also, you should remember that in any experiment, it is important to remove any potential for uncontrolled materials or conditions compromising your determination of results.