10 ml of ethanoic acid was taken in two test tubes I and II each. Blue and Red litmus papers were dipped into test tube I and solid sodium hydrogen carbonate was added to test tube II.
The following observations were reported :
i) Red litmus turned blue in I and no change was observed in II
ii) Blue litmus turned red in I and brisk effervescence was observed in II.
iii) Red litmus turned blue in I and a gas of odour like vinegar evolved in II.
iv) Blue litmus turned red in I and a gas which supports combustion evolved in II.
Which observation correctly represents the characteristics of ethanoic acid

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iii

answer is B.

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Detailed Solution

Test (I) contains ethanoic acid it turns blue litmus paper to red.

Test (II) gives ${CO}_{2}$ gas brisk effervescence

${CH}_{3} COOH (a q) + {NaHCO}_{3} (s) \to {CH}_{3} COONa (a q) + H_{2} O (l) + \underset{Brisk effervescence}{{CO}_{2} (g)} ↑$

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