Question 6 - MCQs from Past Year Papers - Chapter 4 Class 10 - Carbon and its Compounds

Last updated at April 16, 2024 by

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?

(a) No reaction takes place.

(b) A colourless gas with pungent smell is released with brisk effervescence.

(c) A brown coloured gas is released with brisk effervescence.

(d) Formation of bubbles of a colorless and odorless gas.

 

Answer

When acetic acid is added to sodium bicarbonate, the following reaction takes place:

Reaction of Sodium hydrogen carbonate with Ethanoic acid - Teachoo.png

                    

Bubbles of CO 2 gas (which is colorless and odourless ) are seen.

Checking the options

  • (a) No reaction takes place - This is incorrect.
  • (b) A colourless gas with a pungent smell is released with brisk effervescence - CO 2  gas is odorless. Hence, this is incorrect.
  • (c) A brown coloured gas is released with brisk  effervescence - CO 2   gas is colorless. Hence, this is incorrect.  
  • (d) Formation of bubbles of a colourless and odourless gas - This is correct since CO 2 is colorless and odourless and it also produces a brisk effervescence.

Therefore, the correct option is (d) - formation of bubbles of a colorless and odourless gas.

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Transcript

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? (a) No reaction takes place. (b) A colourless gas with pungent smell is released with brisk effervescence. (c) A brown coloured gas is released with brisk effervescence. (d) Formation of bubbles of a colorless and odorless gas. Answer When acetic acid is added to sodium bicarbonate, the following reaction takes place: Reaction of Sodium hydrogen carbonate with Ethanoic acid CH3COOH NaHCO3 CH3COONa H2O CO2 (Sodium bicarbonate) (Sodium hydrogen carbonate) Sodium ethanoate Bubbles of CO2 gas (which is colorless and odourless) are seen. Checking the options (a) No reaction takes place - This is incorrect. (b) A colourless gas with a pungent smell is released with brisk effervescence - CO2 gas is odorless. Hence, this is incorrect. (c) A brown coloured gas is released with brisk effervescence - CO2 gas is colorless. Hence, this is incorrect. (d) Formation of bubbles of a colourless and odourless gas - This is correct since CO2 is colorless and odourless and it also produces a brisk effervescence. Therefore, the correct option is (d) - formation of bubbles of a colorless and odourless gas.

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo