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Water hardness

3 PYQ across 3 exams · 2020–2026 — the complete chronological timeline of how UPSC has tested this idea, oldest to newest.

CAPF 2020 → CDS 2026 → GEO 2026
20201 PYQ
CAPFQ11
Which one of the following methods can be used to remove permanent hardness of water?…
20262 PYQs
CDSQ27
Consider the following statements : 1. The temporary hardness in water is due to the presence of bicarbonates of calcium. 2. The permanent h…
GEOQ67
Which of the following methods can be used for removing permanent hardness of water? I. Treatment with washing soda II. By ion exchange meth…
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