JEE Advanced Chemistry question

Chemistry The p-Block Elements JEE Advanced

Match the acids (Column-I) with the number of acid salts formed by them (Column-II).

Column-I: (A) Hypophosphorous acid (B) Orthophosphorous acid (C) Orthophosphoric acid (D) Mellitic acid Column-II: (p) Two (q) Zero (r) One (s) Five

Codes:

(A)A-q, B-r, C-p, D-sCorrect
(B)A-r, B-p, C-q, D-s
(C)A-p, B-q, C-s, D-r
(D)A-q, B-s, C-p, D-r

Answer: (A)

Solution

Hypophosphorous acid (H3PO2) is monobasic (only one of its three H atoms is ionisable, the other two being non-acidic P−H bonds), so it can form no acid salt at all (q, "zero"). Orthophosphorous acid (H3PO3) is dibasic (two ionisable OH groups), and a dibasic acid can give exactly one type of acid salt, e.g. NaH2PO3

See the full step-by-step solution

Create a free account to read the complete working, and practise questions like this in a timed test.

Create a free account

Question ID VK-159521