JEE Main 2019 — Hydrogen Question with Solution
From: JEE Main 2019 (Online) 12th April Evening Slot
Question
The temporary hardness of a water sample is due to compound X. Boiling this sample converts X to
compound Y. X and Y, respectively, are :
Choose an option
Show full solutionCorrect option: D
Correct answer
DMg(HCO3)2 and Mg(OH)2
Step-by-step explanation
Accoring to NCERT this is the right reaction
Mg(HCO3)2 Mg(OH)2 + CO2 + H2O
But right reaction should be,
Mg(HCO3)2 MgCO3 + CO2 + H2O
Mg(HCO3)2 Mg(OH)2 + CO2 + H2O
But right reaction should be,
Mg(HCO3)2 MgCO3 + CO2 + H2O
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This is a previous-year question from JEE Main 2019, covering the Hydrogen chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.