SawaalBoxसवाल बॉक्स
1998 · Q129Science & TechnologyChemistryeasy

Assertion (A): Phenyl is used as a household germicide. Reason (R): Phenyl is a phenol derivative and phenol is an effective germicide.

  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
Show answerHide answer

Official answer(a) Both A and R are true, and R is the correct explanation of A

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