A student takes about 2 mL ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations:
I. Immediately a colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought near it.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observation is:

I,II and III

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II,III and IV

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III,IV and I

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I,II and IV

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Solution

The correct option is D I,II and IV
Ethanoic acid reacts with sodium hydrogen carbonate to liberate carbon dioxide gas.
$C H_{3} C O O H + N a H C O_{3} \to C H_{3} C O O N a + H_{2} O + C O_{2}$
$C O_{2}$ is a colourless and odourless gas and is evolved with brisk effervescence.
$C O_{2}$ gas reacts with caclium oxide (lime water) to form calcium carbonate which is milky in appearence.
$C a O + C O_{2} \to C a C O_{3}$
The $C O_{2}$ gas extinguishes the burning splinter that is brought near it.

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Similar questions

A student takes 2 mL acetic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He makes the following observations

I. A colorless and odourless gas evolves with a brisk effervescence.

II. The gas turns lime water milky when passed through it.

III. The gas burns with an explosion when a burning splinter is brought near it.

The gas extinguishes the burning splinter that is brought near it.

The correct observations are

Question 10.
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)

Q. 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.

Q. 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)

A student added acetic acid to test tubes I, II, III and IV containing the labeled substance and then brought a burning splinter near the mouth of each test tube.

The splinter would be extinguished when brought near the mouth of test tube:

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