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Solution


Q.

When you add a few drops of acetic acid to a test-tube containing sodium bicarbonate powder, which one of the following is your observation
1 No reaction takes place  
2 A colourless gas with pungent smell is released with brisk effervescence  
3 A brown coloured gas is released with brisk effervescence  
4 Formation of bubbles of a colourless and odourless gas  

Ans.

(4)

When a few drops of acetic acid is added to the test tube containing sodium bicarbonate powder, sodium acetate is formed along with the release of colourless and odourless CO? gas which can be observed as the bubbles in the test tube.