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Railways PYQCBT 1 2016

RRB NTPC · Question 99

Which of the following is not a bleaching agent? A. Sodium hypochlorite B. Calcium hypochlorite C. Hydrogen peroxide D. Hydrogen sulphide

  1. D

  2. C

  3. A

  4. B

Show answer & explanation

Answer: (A) D

Explanation

Sodium hypochlorite, calcium hypochlorite (bleaching powder) and hydrogen peroxide bleach by oxidation. Hydrogen sulphide is a reducing agent and a toxic gas smelling of rotten eggs; it is not used as a bleaching agent.