JEE Main 2020 — Some Basic Concepts Of Chemistry Question with Solution
From: JEE Main 2020 (Online) 9th January Morning Slot
Question
The hardness of a water sample containing
10–3 M MgSO4 expressed as CaCO3 equivalents
(in ppm) is ______.
(molar mass of MgSO4 is 120.37 g/mol)
(molar mass of MgSO4 is 120.37 g/mol)
Enter your answer
Show full solutionCorrect answer: 100
Correct answer
100
Step-by-step explanation
Equivalance of MgSO4 = Equivalance of CaCO3
10-3 2 = [CaCO3] 2
[CaCO3] = 10-3 M = 10-3 mol/lit
= 10-3 100 g/lit
= 100 mg/lit
= 100 ppm
10-3 2 = [CaCO3] 2
[CaCO3] = 10-3 M = 10-3 mol/lit
= 10-3 100 g/lit
= 100 mg/lit
= 100 ppm
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