Question

Assertion A: The determination of pH value of sewerage is important.

Reason R: The efficiency of certain treatment method depends upon the availability of the pH value.

Which of the following is correct?

1. A is true but R is false.
2. Both A and R are true, and R is the correct explanation of A
3. A is false but R is true.
4. Both A and R are true, but R is not a correct explanation of A

Answer 1

Correct Answer - Option 2 : Both A and R are true, and R is the correct explanation of A

Explanation:

pH:

• It is a scale that is used to indicate the acidity or basicity in the range of 0-14.
• pH = -log[H⁺] (where, [H⁺] in moles/liter).
• pOH = -log[OH^-] (where, [OH^-] in moles/liter).
• pH + pOH = 14
• pH is measured by Potentiometer having calomel electrode.

​The determination of the pH value of sewerage is very important because digestion of sewage is mainly done by a micro-organism that can survive in a very narrow pH range so if proper examination of pH is not done it will affect the efficiency of many treatments.