JEE Main 201912 Jan, Morning shiftChemistryMediumRedox Reactions and Electrochemistry138× since 2002
The hardness of a water sample (in terms of equivalents of CaCO₃) containing 10^–3 M CaSO₄ is (Molar mass of CaSO₄ = 136 g mol^–1)
JEE Main 2019 · 12 Jan, Morning shift · Q1791