Match the aqueous solutions of acids, bases and salts mentioned in list-I with their pH and nature mentioned in list-II & answer the following. List - I: (I) HCOOH (pKa = 3.74, 0.1 M) + HCOONa (0.1 M)

Question

Match the aqueous solutions of acids, bases and salts mentioned in list-I with their pH and nature mentioned in list-II & answer the following.

List - I:
(I) HCOOH (pKa = 3.74, 0.1 M) + HCOONa (0.1 M)
(II) CH3COOH (0.1 M) + HCl (0.1 M)
(III) CH3COOH (pKa = 4.74, 0.1 M) + NH4OH (pKa = 9.26, 0.1 M)
(IV) HCOONa (300 mL of 0.1 M) + HCl (100 mL of 0.1 M)

List - II:
(P) Acidic buffer at its maximum capacity
(Q) behaves as a buffer
(R) pH < 7 at 298 K
(S) pH = 7 at 298 K
(T) pH > 7 at 298 K

The correct combination out of the following is

Prashant Kotian · Accepted Answer

Correct answer: D. Fluorine is most reactive amongst halides and has highest oxidising power

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