JEE Main 2017 · ChemistryMultiple choiceSingle correctEasyCalculation

JEE Main 2 April 2017 (offline), Chemistry Q40

Question 40 of 90 in this shift, Chemistry question 10 of 30.

pK_a

of a weak acid (HA) and

pK_b

of a weak base (BOH) are 3.2 and 3.4, respectively. The pH of their salt (AB) solution is :

(1)7.0
(2)1.0
(3)7.2
(4)6.9Official answer

Official answer

Option 4

CBSE answer key (25/04/2017, used for result).

Chapter: Equilibrium
Topic: pH and Buffers
Idea tested: pH of Weak Acid-Weak Base Salts

Same idea in other shifts

Asked 4× in all

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Question text from the official JEE Main paper published by NTA (CBSE ran the 2017 exam); answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.