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JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumCalculation

JEE Main 9 January 2020, Shift 1, Chemistry Q49

Question 49 of 75 in this shift, Chemistry question 24 of 25, Section B.

The hardness of a water sample containing

10^{-3}

M

\mathrm{MgSO_4}

expressed as

\mathrm{CaCO_3}

equivalents (in ppm) is ________. (molar mass of

\mathrm{MgSO_4}

is 120.37 g/mol)

Official answer

100.00 to 100.00

NTA final key (Jan 2020). Any value in the range scored.

Chapter: Hydrogen
Topic: Hydrogen and Hydrides
Idea tested: Causes of Temporary and Permanent Hardness

Same idea in other shifts

Asked 2× in all

30 Jul 2022, Shift 2 · Q37The hardness of water is generally expressed in terms of $\mathrm{CaCO_3}$ equivalent. The possible reasons are as follows: (A) Its molar…MediumOther

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.