A student adds a few drops of ethanoic acid to test tubes $X, Y$ and $Z$ containing aqueous solutions of sodium chloride, sodium hydroxide and sodium carbonate respectively. If he now brings a burning splinter near the mouth of the test tubes immediately after adding the ethanoic acid in each one of them, in which of the test tube or test tubes the flame gets extinguished?

X and Y

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Y and Z

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X and Z

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Only Z

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Solution

The correct option is D Only Z
1. Test tube $X :$ Ethanoic acid does not react with sodium chloride. Hence, the flame is not extinguished.

2. Test tube $Y :$ $C H_{3} C O O H + N a O H \to C H_{3} C O O N a + H_{2} O$

Flame is not extinguished as there is no direct contact between water and flame.

3. Test tube $Z :$ $2 C H_{3} C O O H + N a_{2} C O_{3} \to C H_{3} C O O N a + C O_{2} + H_{2} O$

Flame is extinguished due to the emission of $C O_{2}$ . Hence, on bringing test tube Z near a burning splinter, flame is extinguished as $C O_{2}$ does not support combustion.

Option D is correct.

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