Advertisements
Advertisements
Questions
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?
What happens when iron nails are put into copper sulphate solution?
Advertisements
Solution
When an iron nail is placed in copper sulphate solution, then iron sulphate solution and copper metal are formed.
\[\ce{\underset{(Blue solution)}{\underset{Copper sulphate}{CuSO4_{(aq)}}} + \underset{(Grey)}{\underset{Iron}{Fe_{(s)}}} -> \underset{(Greenish solution)}{\underset{Iron sulphate}{FeSO4_{(aq)}}} + \underset{(Red-brown)}{\underset{Copper}{Cu_{(s)}}}}\]
In this process, iron displaces copper from a copper sulphate solution. The deep blue hue of copper sulphate solution diminishes as it transforms into a light green solution of iron sulphate. A red-brown layer of copper metal is deposited on the surface of iron metal. This displacement reaction occurs because iron is more reactive than copper.
RELATED QUESTIONS
‘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’.
Which gas is produced when dilute hydrochloric acid is added to a reactive metal?
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.
Differentiate between metal and non-metal on the basis of their chemical properties.
The white powder formed when magnesium ribbon burns in oxygen is of ______.
Ordinary aluminium strips are not attacked by water because of the presence of a layer of ______ on the surface of aluminium.
You are given samples of three metals − sodium, magnesium and copper. Suggest any two activities to arrange them in order of their decreasing reactivities.
Name another metal oxide which behaves like aluminium oxide.
Write the equation for the reaction of Magnesium with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
Write the equation for the reaction of Zinc with dilute hydrochloric acid.
Name the products formed. Also indicate the physical states of all the substances involved.
What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
Name one metal more reactive and another less reactive than hydrogen.
Name one metal which displaces copper from copper sulphate solution and one which does not.
Name one metal which displaces silver from silver nitrate solution and one which does not.
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
Out of the following oxides, the amphoteric oxide is:
(a) Fe2O3
(b) Al2O3
(c) P2O5
(d) N2O
When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so?
Write the chemical equation for the following reaction:
Calcium metal reacts with water.
Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?
- Good thermal conductivity
- Good electrical conductivity
- Ductility
- High melting point
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
