question_answer 28)

    Sodium hydrogen carbonate when added to acetic acid evolves a gas. Which of the following statements are true about the gas evolved?                 (i) It turns lime water milky.                 (ii) It extinguishes a burning splinter.                 (iii)It dissolves in a solution of sodium hydroxide.                 (iv) It has a pungent odour.                 (a) (i) and (ii)                      (b) (i), (ii) and (iii)             (c) (ii), (iii) and (iv)           (d) (i) and (iv)             

Answer:

  (b) When sodium hydrogen carbonate is added to acetic acid then carbon dioxide (CO2)gas is evolved. CO2 turns lime water milky, :it is a non-supporter of combustion and is absorbed by strong alkalies like NaOH.