Question 6 - MCQs from Past Year Papers - Chapter 4 Class 10 - Carbon and its Compounds
Last updated at May 29, 2023 by Teachoo
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:
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.
Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class
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.
CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo
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