Q. 25.0( 2 Votes )

Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was evolved. The gas was passed through lime water which turned milky. It was concluded that.
A. Solid X is sodium hydroxide and the gas evolved is CO2,

B. Solid X is sodium bicarbonate and the gas evolved is CO2

C. Solid X is sodium acetate and the gas evolved is CO2

D. Solid X is sodium chloride and the gas evolved is CO2

Answer :

When any acid reacts with metal hydrogencarbonate, the products formed are salt, carbon dioxide (CO2) and water.


Metal hydrogencarbonate + Acid Salt + Carbon dioxide + Water


Hence, when acetic acid reacts with sodium bicarbonate (NaHCO3), a colourless and odourless of carbon dioxide gas is evolved.


When carbon dioxide gas is passed through lime water [(CaOH)2], the following reaction takes place:



i. In this reaction, when limewater comes in contact with the gas


released in the form of an effervescence, it turns milky. This is a


chemical test for carbon dioxide gas.


ii. When limewater turns milky, it is confirmed that the


effervescence is of carbon dioxide.


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