Advertisements
Advertisements
प्रश्न
A zinc plate was kept in a glass container having CuSO4 solution. On examining it was found that the blue colour of the solution is getting lighter and lighter. After a few days, when the zinc plate was taken out of the solution, a number of small holes were noticed in it. State the reason and give chemical equation of the reaction involved.
Advertisements
उत्तर
Zinc is more reactive than copper; hence, zinc displaces copper from a copper sulphate solution to form a green zinc sulphate solution, which is of green colour, and copper. It is due to the formation of the green zinc sulphate solution that the blue colour of copper sulphate becomes progressively lighter.
Zinc from the rod reacts with the solution to form zinc sulphate solution. So the plate has several small holes.
\[\ce{Zn_{(s)} + CuSO4_{(aq)} -> ZnSO4_{(aq)} + Cu_{(s)}}\]
APPEARS IN
संबंधित प्रश्न
‘E’ is an element which reacts with oxygen to form an oxide E2O. An aqueous solution of E2O turns red litmus blue, so:
i. What is the nature of oxide E2O ?
ii. Write the name of element ‘E’.
Show the formation of Na2O by the transfer of electrons.
You must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
Name two metals which form amphoteric oxides.
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
Which of the following elements would yield an acidic oxide?
Na, S, C, K, H
Which of the following elements would yield a basic oxide?
Na, S, C, K, H
What happens when a rod of zinc metal is dipped into a solution of copper sulphate? Give chemical equation of the reaction involved.
Give one example, with equation, of the displacement of hydrogen by a metal from an acid.
Write one reaction in which aluminium oxide behaves as a basic oxide and another in which it behaves as an acidic oxide.
Write the chemical equation of the reaction which takes place when iron reacts with dilute sulphuric acid. What happens when the gas produced is ignited with a burning matchstick?
Which non-metal has been placed in the reactivity series of metals?
One of the following is not a neutral oxide. This is:
Out of the following oxides, the amphoteric oxide is:
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be ______.
In nature, metal A is found in a free state while metal B is found in the form of its compounds. Which of these two will be nearer to the top of the activity series of metals?
Which one among the following is an acidic oxide?
