MEDIUM
10th CBSE
IMPORTANT
Earn 100
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green. Write a balanced chemical equation of the reaction which takes place.
Important Questions on Acids, Bases And Salts
EASY
10th CBSE
IMPORTANT
On adding dilute hydrochloric acid to copper oxide powder, the solution formed is blue-green.
On the basis of the above reaction, what can you say about the nature of copper oxide?
EASY
10th CBSE
IMPORTANT
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown.
On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again. Name the natural indicator present in curry stain.
(Grape juice/ Turmeric/ Beetroot)
MEDIUM
10th CBSE
IMPORTANT
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again
Explain the changes in the colour of this indicator which take place during washing and rinsing the shirt.
HARD
10th CBSE
IMPORTANT
A white shirt has a yellow stain of curry. When soap is rubbed on this shirt during washing, the yellow stain turns reddish-brown. On rinsing the shirt with plenty of water, the reddish-brown stain turns yellow again. What is the nature of soap (acidic/basic) as shown by the indicator present in curry stain?
EASY
10th CBSE
IMPORTANT
You have been provided with three test-tubes. One of these test-tubes contains distilled water, and the other two contain an acidic and a basic solution, respectively. If you are given only blue litmus paper, how will you identify the contents of each test-tube?
MEDIUM
10th CBSE
IMPORTANT
A substance which is used as an antacid, reacts with dilute hydrochloric acid to produce a gas Y which is used in one type of fire-extinguisher. Name the substance and gas . Write a balanced equation for the chemical reaction, which takes place.
MEDIUM
10th CBSE
IMPORTANT
How is the neutralisation of carbonate with an acid different from the neutralisation of an oxide or a hydroxide?
EASY
10th CBSE
IMPORTANT
What happens to (a) the ions, and (b) temperature of the solution, when an acid is neutralised?
