(A) : Addition of HCl(aq) to HCOOH(aq) decreases the ionization of HCOOH.
(R) : Common ion effect of H⁺ ion, reduces the ionization of HCOOH.

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Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

(A) is true but (R) is false

answer is A.

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Detailed Solution

The degree of dissociation of a weak electrolyte is suppressed by the addition of another electrolyte containing the common ion is known as Common ion effect

So, addition of HCl(aq.) to HCOOH(aq.) decrease the ionization of HCOOH(aq.) due to common ion effect of H⁺ ion.

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