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

\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 :

\mathrm{Mg(OH)_2}

is assumed to dissociate completely in

\mathrm{H_2O}

]

Official answer

NTA final key.

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

Same idea in other shifts

Asked 7× in all

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
12 Apr 2023, Shift 1 · Q85An analyst wants to convert 1L HCl of pH =1 to a solution of HCl of pH 2. The volume of water needed to do this dilution is _________ mL.…EasyNumerical value
27 Jun 2022, Shift 2 · Q86pH value of 0.001 M NaOH solution is ________.EasyNumerical value
4 Aug 2021, Shift 2 · Q57 $x \times 10^{-5}$ g of $\mathrm{Ca(OH)_2}$ are required to produce 200 $\mathrm{cm^3}$ of an aqueous solution of pH 10.0. The value of…MediumNumerical value
31 Aug 2021, Shift 2 · Q56The pH of a solution obtained by mixing 50 mL of 1 M HCl and 30 mL of 1 M NaOH is $x \times 10^{-4}$ . The value of $x$ is __________.…EasyNumerical value
25 Jul 2021, Shift 2 · Q56Assuming that $\mathrm{Ba(OH)_2}$ is completely ionised in aqueous solution under the given conditions the concentration of…EasyNumerical value

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 108 of the 174 JEE Main shifts held from 2017 to 2026.