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2000 · Q112Science & TechnologyChemistryeasy

A small pouch containing silica gel is often found in bottles of medicine in tablet or powder form because silica gel

  1. (a)kills bacteria
  2. (b)kills germs and spores
  3. (c)absorbs moisture
  4. (d)absorbs all gases present inside the bottle
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Official answer(c) absorbs moisture

2010 · Q11Science & TechnologyChemistryeasy

Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to

  1. (a)The formation of hydrochloric acid when chlorine is added to water
  2. (b)The formation of hypochlorous acid when chlorine is added to water
  3. (c)The formation of nascent oxygen when chlorine is added to water
  4. (d)The formation of hydrogen when chlorine is added to water
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Official answer(b) The formation of hypochlorous acid when chlorine is added to water