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General Principle of Extraction of Metal Important Questions

Extraction of Metals
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Extraction of Metals from Ores

Question 1
Naturally occurring substances from which a metal can be profitably (or economically) extracted are called
A
Salts
B
Ores
C
Minerals
D
Gangue
Question 2
Which of the following metal is not found in free state?
A
Pb
B
Na
C
Au
D
Ag
Question 3
Difference in density is the basis of

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A
Molecular attraction
B
Molecular sieving
C
Ultrafiltration
D
Gravity separation
Question 4
Bauxite is an oxide ore of
A
Aluminium
B
Bismuth
C
Boron
D
Barium
Question 5
Which of the following is not an ore of lead?
A
Cerrusite
B
Calamine
C
Anglesite
D
Galena
Question 6
In the metallurgy of zinc, flux is not used because
A
Zinc is volatile hence easily separated
B
Zinc ore has no impurities
C
Flux is volatile
D
Zinc reacts with flux
Question 7
Which metal is found in Khetri region of Rajasthan?
A
Copper
B
Iron
C
Lead
D
Gold
Question 8
Which of the following is a carbonate ore?

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A
Pyrolusite
B
Malachite
C
Diaspore
D
Cassiterite
Question 9
Azurite is an ore of
A
Cu
B
Pt
C
Au
D
Ag
Question 10
Main function of roasting is
A
Reduction
B
To remove volatile substances
C
Oxidation
D
Slag formation
Question 11
Sulphide ores are generally concentrated by
A
Gravity separation
B
Magnetic separation
C
Froth floatation process
D
By hand picking
Question 12
Which of the following is not a mineral of iron ?
A
Magnetite
B
Siderite
C
Smithsonite
D
Limonite
Question 13
In the froth floatation process for the purification of ores, the ore particles float because
A
They bear electrostatic charge
B
Their surface is not easily wetted by water
C
They are light
D
They are insoluble
Question 14
Which of the following ore is used for industrial extraction of aluminium in India?
A
Bauxite
B
Cryolite
C
Corundum
D
Keolin
Question 15
Sapphire is mineral of
A
Zn
B
Cu
C
Al
D
Mg
Question 16
Cryolite is

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A
Sodium aluminium fluoride
B
Magnesium silicate
C
Magnesium silicate
D
Sodium borofluoride
Question 17
Which is correct?
A
Aluminium : Calamine
B
Magnesium : Calamine
C
Copper : Malachite
D
Zinc : Carnellite
Question 18
The process of ore dressing is carried out to
A
Remove the poisonous impurities
B
Convert the ore to oxide
C
Remove the siliceous materials
D
Add flux to the mineral
Question 19
Of the following substances the one which does not contain oxygen is
A
Cryolite
B
Bauxite
C
Epsom salt
D
Dolomite
There are 19 questions to complete.
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Vishal Arora

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