UGC NET Paper 1 — Chemistry
14 questions across 6 years
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4 questions shown from 2023.
Which of the following statements are true about hardness in water ? (A) It is caused by ions of calcium and magnesium (B) It is of two types-temporary and permanent (C) Permanent...
Photo-electro-chemical decomposition of water is done to 1. To produce hydrogen 2. To remove pathogens from water 3. To remove metals from water 4. To remove oil and grease from wa...
At pH values above 7.5, the disinfectant capability of chlorine is
Which of the following are true about the hard water? A. Hardness in water can occur in both surface and underground waters. B. Hardness increases the cleaning efficiency of water....