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2000 · Q108Science & TechnologyChemistrymoderate

Match List I with List II and select the correct answer using the codes given below the Lists: List I I. German Silver II. Solder III. Bleaching Powder IV. Hypo List II A) Tin B) Nickel C) Sodium D) Chlorine Codes:

  1. (a)I-A, II-B, III-D, IV-C
  2. (b)I-B, II-A, III-C, IV-D
  3. (c)I-A, II-B, III-C, IV-D
  4. (d)I-B, II-A, III-D, IV-C
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Official answer(d) I-B, II-A, III-D, IV-C

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