SawaalBoxसवाल बॉक्स
2014 · Q70Science & TechnologyChemistryeasy

Which of the following is/are the example/examples of chemical change? 1. Crystallization of sodium chloride 2. Melting of ice 3. Souring of milk Select the correct answer using the code given below.

  1. (a)1 and 2 only
  2. (b)3 only
  3. (c)1, 2 and 3
  4. (d)None
Show answerHide answer

Official answer(b) 3 only

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
Show answerHide answer

Official answer(b) The formation of hypochlorous acid when chlorine is added to water