Sodium hydrogencarbonate 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
(i) and (ii)
(i), (ii) and (iii)
(ii), (iii) and (iv)
(i) and (iv)
Steps: Reaction produces CO₂. CO₂ turns lime water milky (i), extinguishes burning splinter (ii), and dissolves/reacts with NaOH forming carbonate/bicarbonate (iii). It has no pungent odour (iv false).