Question

Ethanoic acid was added to sodium hydrogen-carbonate solution and the gas evolved was tested with a burning splinter. The following four observations were reported:
(a) The gas burns with the pop sound and the flame gets extinguished.
(b) The gas does not burn but the splinter burns with a pop sound.
(c) The flame extinguishes and the gas does not burn.
(d) The gas burns with a blue flame and the splinter burns brightly.

The correct observation is reported in :
(1) (a)
(2) (b)
(3) (c)
(4) (d)

Answer 1

When ethanoic acid is treated with sodium hydrogen carbonate then carbon dioxide gas evolves which produce effervescence. Flame extinguishes and gas does not burn.
${\mathrm{NaHCO}}_3+{\mathrm{CH}}_3\mathrm{COOH}\to {\mathrm{CH}}_3\mathrm{COONa}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$

Hence, the correct answer is option 3.