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Match the column:    Metal    Common method of extraction  (i)  Aluminium  (a)  Electrolysis of oxide dissolved in molten Cryolite  (ii)  Iron  (b)  Roasting followed by reduction with coke  (iii)  Copper  (c)  Roasting of sulphide partially and reduction  (iv)  Zinc  (d)  Reduction of the oxide with CO and coke in blast furnace

Match the column:    Metal    Common method of extraction  (i)  Aluminium  (a)  Electrolysis of oxide dissolved in molten Cryolite  (ii)  Iron  (b)  Roasting followed by reduction with coke  (iii)  Copper  (c)  Roasting of sulphide partially and reduction  (iv)  Zinc  (d)  Reduction of the oxide with CO and coke in blast furnace Correct Answer (i) – (a), (ii) – (d), (iii) – (c), (iv) – (b)

Explanation:

  • The mixture of Cryolite and aluminium oxide has a lower melting point than pure aluminium oxide.
  • This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost-effective.

Anode Reaction:

6 O-2 → 3 O2 + 12 e-

Cathode Reaction:

4 Al+3 + 12 e- → 4 Al

  • The roasted ore is mixed with coke and silica (sand) and is introduced into a blast furnace. The hot air is blasted and FeO is converted into ferrous silicate (FeSiO3​). This process is known as smelting of iron.
  • Here coke is added to check further oxidation of iron and to remove it as slag.  


Fe2O3 + 3CO → 2Fe + 3CO

And

2 C(s) + O2(g) → 2 CO

Partial roasting of sulphide ore is done in the metallurgy of copper.

Partial reduction of sulphide ores give copper oxide which further reacts with copper sulphide to show auto reduction.

2 CuS +3 O2 → 2 CuO + 2 SO2

2 CuO + CuS → 3 Cu + SO2

  • This process of obtaining zinc from its oxide with help of coke is called as smelting.
  • Zinc oxide is reduced to zinc by heating with coke. Zinc is led off as vapour which is then cooled and collected.


ZnO + C + ∆ → Zn + CO

So, correct matching is (i) – (a), (ii) – (d), (iii) – (c), (iv) – (b)

Related Questions

Which of the following facts is/are correct about the blast furnace in Iron metallurgy? Limestone is added to the blast furnace to reduce the iron oxide in the ore to iron. Coke is added to the blast furnace to physically separate iron from other impurities. Carbon dioxide reduces to carbon monoxide.
Which of the following statements is/are correct? A. Iron can replace zinc from zinc sulphate solution. B. Zinc can replace copper from copper sulphate solution. C. Copper can replace Iron from Iron sulphate solution.
An iron blast furnace produces hot metal containing 95% Fe. The iron ore charged into the furnace contains 95% Fe2O3 and the rest is gangue. Assume that all the iron in the ore goes to hot metal. The amount of iron ore (in kg) required for producing 1000 kg of hot metal is (Atomic weight of Fe = 56 g mol-1 and that of Fe2O3 = 160 g mol-1)
If a 1 kg of metal having 25% of zinc and rest is copper is mixed with 5 kg of metal having 40% zinc and rest is other ‘P' metal. What is the ratio of three elements(Zinc, Copper & 'P' metal) in the resulting mixture?
There are two alloys of copper and aluminium, alloy A has 40% aluminium and alloy B has 10% copper. In what ratio should these alloys be mixed so that the cost of total copper becomes equal to the cost of total aluminium in the mixture? (The cost price of aluminium is Rs. 200 per kg and cost price of copper is Rs. 500 per kg)
4 kg of a metal contains 1/5 copper and rest in Zinc. Another 5 kg of metal contains 1/6 copper and rest in Zinc.The ratio of Copper and Zinc into the mixture of these two metals:
In a certain code language, Copper is called Iron, Iron is called Sodium, Sodium is called Mercury, Mercury is called Zinc, Zinc is called Aluminium, Aluminium is called Silver and Silver is called Platinum. In this language, which of the following is a liquid metal?
If 2 kg of metal, of which 1/3 is zinc and the rest is copper s, be mixed with 3 kg of metal , of which 1/4 is zinc and the rest is copper , then what will be the ratio of zinc to copper in the mixture?
In the question three statements are given, followed by three conclusions, I, II and III. You have to consider the statements to be true even if it seems to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements. Statement I: No bronze is copper. Statement II: Some alloy is bronze. Statement III: Some zinc is alloy. Conclusion I: Some zinc is bronze. Conclusion II: Some copper is zinc. Conclusion III: some alloy is copper.
In an ideal blast furnace, the input and output are as follows:
Input:
Ore, Pure Fe2O3, no gaunge : 1357kg/THM∗
Coke, Pure C, no ash : 400 kg/THM
Blast air, dry : O2 : 293 kg/HTM, N2 : 964 KG/THM
Flux : nil
Output :
Hot metal : 5wt% C, rest iron
Slag : nil
Top gas : CO, CO2, N2
∗ THM refers ton of hot metal (liquid pig iron) ; Atomic weights: C-12, O-16, Fe-56 The amount of oxygen in CO & CO2 leaving with the top gas is . . . . . . . . kg.