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Assertion (A): Addition of \( \mathrm{CH}_{3} \mathrm{COONa} \) to \( \mathrm{CH}_{3} \mathrm{COOH} \) increases the \( \mathrm{pH} \) of solution but addition of \( \mathrm{NH}_{4} \mathrm{Cl} \) to \( \mathrm{NH}_{4} \mathrm{OH} \) decreases the \( \mathrm{pH} \) of solution.
Reason (R): \( \mathrm{pH} \) of the solution changes because of common ion effect.
(A) Both A and R are true and R is the correct explanation of A.br(B) Both A and R are true, but R is not the correct explanation of A.
(C) A is true, but R is false.
(D) A is false, but R is true.
(E) Both A and R are false.
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