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2008 · Q8Science & TechnologyChemistryeasy

What is Bisphenol A (BPA)?

  1. (a)A medical test for detecting cancer
  2. (b)A test for testing the use of drugs to improve performance by athletes
  3. (c)A chemical used for the development of food-packaging materials
  4. (d)A special type of alloy steel
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Official answer(c) A chemical used for the development of food-packaging materials

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