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Friday, 9 October

JEE Main 2025 · ChemistryNumerical answerNumerical valueEasyCalculation

JEE Main 4 April 2025, Shift 2, Chemistry Q71

Question 71 of 75 in this shift, Chemistry question 21 of 25, Section B.

x mg of Mg(OH)2\mathrm{Mg(OH)_2} (molar mass = 58) is required to be dissolved in 1.0 L of water to produce a pH of 10.0 at 298 K. The value of x is __________ mg. (Nearest integer) (Given : Mg(OH)2\mathrm{Mg(OH)_2} is assumed to dissociate completely in H2O\mathrm{H_2O}]

Official answer

3

NTA final key.

Chapter
Equilibrium
Topic
pH and Buffers
Idea tested
pH of Strong Acids and Bases

Same idea in other shifts

Asked 2× in all
  1. 7 Apr 2025, Shift 1 · Q54An aqueous solution of HCl with pH 1.0 is diluted by adding equal volume of water (ignoring dissociation of water). The pH of HCl solution…EasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.