An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

Q. An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

  1. Baking powder
  2. Lime
  3. Ammonium hydroxide solution
  4. Hydrochloric acid

Answer: Hydrochloric acid

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