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Question
A student takes Na2CO3 powder in a test tube and pours some drops of acetic acid over it. He observes:
(A) no reaction in the test tube
(B) colourless gas with pungent smell
(C) bubbles of a colourless and odourless gas
(D) white fumes with smell of vinegar
Solution
Acetic acid reacts with Na2CO3 to form sodium acetate, carbon dioxide and water. It is this colourless gas carbon dioxide gas which comes out as bubbles.
The Correct Answer is C
RELATED QUESTIONS
For preparing soap in the laboratory we require an oil and a base. Which of the following combinations of an oil and a base would be best suited for the preparation of soap?
(a) Castor oil and calcium hydroxide
(b) Turpentine oil and sodium hydroxide
(c) Castor oil and sodium hydroxide
(d) Mustard oil and calcium hydroxide
What type of compound is formed when a carboxylic acid reacts with an alcohol in the presence of conc. H2SO4?
Which of the following observations is true about dilute solution of acetic acid?
(A) It smells like vinegar and turns red litmus blue
(B) It smells like onion and turns blue litmus red
(C) It smells like orange and turns red litmus blue
(D) It smells like vinegar and turns blue litmus red
A student adds 4 mL of acetic acid to a test tube containing 4 mL of distilled water. He then shakes the test tube and leaves it to settle. After about 10 minutes he observes:
(A) a layer of water over the layer of acetic acid
(B) a layer of acetic acid over the layer of water
(C) a precipitate settling at the bottom of the test tube
(D) a clear colourless solution
What is vinegar and glacial acetic acid?
What is the main constituent of vinegar?
Why is pure acetic acid also known as glacial acetic acid?
Write a fully balanced equation for the folowing case:
Acitic acid is warmed with ethanol in the presence of concentrated sulpheric acid.
When ethanoic acid is treated with NaHCO^ the gas evolved is ______.
Why is glacial acetic acid called so?
