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1998 · Q130Science & TechnologyChemistryeasy

Assertion (A): Sodium metal is stored under kerosene. Reason (R): Metallic sodium melts when exposed to air.

  1. (a)Both A and R are true, and R is the correct explanation of A
  2. (b)Both A and R are true, but R is NOT a correct explanation of A
  3. (c)A is true, but R is false
  4. (d)A is false, but R is true
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Official answer(c) A is true, but R is false

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