DEPARTMENT OF CHEMISTRY
NAME: ……………………………………………
CLASS: VIII / ………….
TOPIC: EXTRACTION OF METALS
DATE: ………….….....
WORKSHEET -2 (MCQ)
1. Metals W, X, Y and Z are reacted with dilute hydrochloric acid. The oxides of
metals W, X, Y and Z are heated with carbon. The results are shown.
Reaction
W
X
Y
Z
Metal + dilute Hydrochloric
Fizzing
Fizzing
Violent
No reaction
acid
fizzing
Metal oxide + carbon + heat
No
Metal
No
Metal
reaction
produced
reaction
produced
What is the order of reactivity of the metals?
Most
Least
reactive
reactive
A
Y
W
X
Z
B
Y
X
W
Z
C
Z
W
X
Y
D
Z
X
Z
Y
2. Metal X is more reactive than metal Y. Metal Y is more reactive than metal Z.
Which statement is correct?
A. When metal X is placed in a solution of Y sulfate, there is no reaction.
B. When metal X is placed in a solution of Z sulfate, a reaction occurs.
C. When metal Y is placed in a solution of Z sulfate, there is no reaction.
D. When metal Z is placed in a solution of X sulfate, a reaction occurs.
3. Which metal is most easily obtained from its ore?
A. Aluminium
B. Copper
C. Calcium
D. Iron
4. Which material is not involved in the large-scale extraction of iron from iron
ore?
A. Bauxite
B. Calcium carbonate (limestone)
C. Carbon (coke)
D. Hematite
5. In the blast furnace, the impurity silicon(IV) oxide is removed by the formation
of slag. Which equation represents the formation of the substance which reacts
with silicon(IV) oxide to form slag?
A. C + O2 → CO2
B. C + CO2 → 2CO
C. CaCO3 → CaO + CO2
D. Fe2O3 + 3CO → 2Fe + 2CO2
6. Iron is extracted from Fe2O3 by reduction with carbon. Aluminium is difficult to
extract from Al2O3. Starting with the most reactive, which order of reactivity is
correct?
A. Al → C → Fe
B. Al → Fe → C
C. Fe → Al → C
D. Fe → C → Al
7. Some reactions of three metals and their oxides are shown.
Metal
Metal reacts with
Metal oxide reacts
steam
with carbon
X
No
Yes
Y
Yes
No
Z
Yes
Yes
What is the order of reactivity of the metals?
Most reactive
Least reactive
A
X
Z
Y
B
Y
X
Z
C
Y
Z
X
D
Z
Y
X
8. Which statement about the extraction of iron from hematite is correct?
A. Air is blown into the blast furnace to oxidise the molten iron.
B. Carbon dioxide is reduced by coke to carbon monoxide.
C. Hematite is oxidised by carbon to molten iron.
D. The slag produced is denser than molten iron.
9. Which statement about the extraction of iron in a blast furnace is not correct?
A. Calcium oxide reacts with acidic impurities.
B. Iron(III) oxide is reduced to iron by carbon dioxide.
C. Molten iron is formed at the base of the blast furnace.
D. The raw materials are hematite, limestone and coke.
10.Iron(III) oxide is reduced by carbon monoxide to produce iron and carbon
dioxide. What is the balanced equation for this reaction?
A. Fe2O3 + 2CO → 2Fe + 2CO2
B. Fe2O3 + 3CO → 2Fe + 3CO2
C. 2Fe2O3 + 6CO → 2Fe + 6CO2
D. 2Fe2O3 + 3CO → 4Fe + 3CO2
11.Three metals, X, Y and Z, were reacted with water. The oxides of the same
three metals were also heated strongly with carbon. The results are shown.
Metal
Reaction of the metal with water
Reaction of the metal oxide
with carbon
X
Vigorous reaction with cold water
No reaction
Y
No reaction
Metal and carbon dioxide
produced
Z
No reaction with cold water but
No reaction
reacts with steam
What is the correct conclusion about X, Y and Z?
A. X is sodium and Y is magnesium.
B. X is the least reactive and Y is the most reactive.
C. Z is less reactive than Y.
D. Z is magnesium and Y is copper.
12.In a blast furnace, iron ore is mixed with coke and limestone, and heated in hot
air. Compound R is formed. Compound R then reduces the iron ore to iron.
Which equation shows the formation of compound R?
A. C + O2 → CO2
B. CO2 + C → 2CO
C. CaCO3 → CaO + CO2
D. CaO + SiO2 → CaSiO3
13.Metals W, X, Y and Z are reacted with dilute hydrochloric acid. The oxides of
metals W, X, Y and Z are heated with carbon. The results are shown.
Reaction
W
X
Y
Z
Reaction with water
Fizzes
No
Fizzes
No
reaction
vigorously
reaction
No
Fizzes
Fizzes
reaction
violently
Reaction with dilute hydrochloric
Fizzes
acid
What is the order of reactivity of the metals?
Least
Most
reactive
reactive
A
X
W
Z
Y
B
X
Z
W
Y
C
Y
W
Z
X
D
Y
Z
W
X
ANSWERS
1. A
2. B
3. B
4. A
5. C
6. A
7. C
8. B
9. B
10.B
11.D
12.B
13.B