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2008 · Q116Science & TechnologyChemistryeasy

Which one of the following pairs of metals constitutes the lightest metal and the heaviest metal, respectively?

  1. (a)Lithium and mercury
  2. (b)Lithium and osmium
  3. (c)Aluminium and osmium
  4. (d)Aluminium and mercury
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Official answer(b) Lithium and osmium

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