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Hardness of water

2 PYQ across 1 exam · 2015–2018 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

20151 PYQ
CDSQ7
When hard water is evaporated completely, the white solid remains in the container. It may be due to the presence of 1. Carbonates of Ca and…
20181 PYQ
CDSQ30
Which of the following substances cause temporary hardness in water? 1. Mg(HCO3)2 2. Ca(HCO3)2 3. CaCl2 4. MgSO4 Select the correct answer u…
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