HARD
10th CBSE
IMPORTANT
Earn 100

A piece of white cloth has a yellow stain of curry. When soap is applied on this cloth during washing, the yellow stain turns reddish-brown. On rinsing the cloth with excess of water, the reddish-brown stain again turns yellow.
(a) Name the indicator that may be present in the curry stain.
(b) Explain the changes in colour observed.
(c) Is the soap acidic or basic?
 

Important Questions on Acids, Bases and Salts

EASY
10th CBSE
IMPORTANT
Define an acid and a base. Give one example of each.
EASY
10th CBSE
IMPORTANT
Give the names and formulae of two strong acids and two weak acids.
HARD
10th CBSE
IMPORTANT
State any two chemical properties of acids. Write chemical equation for each.
HARD
10th CBSE
IMPORTANT
20 mL of water and 20 mL sulphuric acid are to be mixed in a beaker. State the method that should be followed with reason and what is the process called?
HARD
10th CBSE
IMPORTANT
How do acids react with metals? Give two examples. What type of reactions are these?
HARD
10th CBSE
IMPORTANT
Are non-metallic oxides acidic or basic in nature? Justify your answer with a suitable reaction.
HARD
10th CBSE
IMPORTANT
What happens when a base reacts with non-metal oxides? Explain with the help of an example. What do you conclude from this reaction?
HARD
10th CBSE
IMPORTANT
By giving reason explain why is it recommended that the acid should be added to water and not water to the acid.