Directions \( \quad \) In the following questions a statement of Assertion (A) followed by a sta...

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Directions \( \quad \) In the following questions a statement of Assertion (A) followed by a statement of Reason \( (\mathrm{R}) \) is given. Choose the correct answer out of the following choices.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \)
(b) Both \( \mathrm{A} \) and \( \mathrm{R} \) are correct; \( \mathrm{R} \) is not the correct explanation of \( \mathrm{A} \)
(c) A is correct; \( \mathrm{R} \) is incorrect
(d) A is incorrect; \( R \) is correct
Assertion (A) Buffer system of carbonic acid and sodium bicarbonate is used for the precipitation of hydrolysis of third group elements.
Reason (R) It maintains the \( \mathrm{pH} \) to a constant value about \( 7.4 \).
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