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Multiple-choice questions related to the extraction of metals. The questions cover topics such as the region where main metals are found, metals found in free state, minerals of different metals, impurities present in metals, and purification of ores. The questions are useful for students studying metallurgy or related fields.
Typology: Exercises
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1. The region in which main metals are found in
earth is called
(a) Atomophil (b) Lithophil
(c) Calcophil (d) Siderophil
2. Which metal is found in free state
(a) Iron (b) Gold
(c) Aluminium (d) Sodium
3. Which metal is found in Khetri region of
Rajasthan
(a) Iron (b) Copper
(c) Gold (d) Lead
4. Sapphire is mineral of [BHU 1977]
(a) Cu (b) Zn
(c) Al (d) Mg
5. Of the following substances the one which does
not contain oxygen is [JIPMER 1997]
(a) Bauxite (b) Epsom salt
(c) Cryolite (d) Dolomite
6. The chief impurity present in red bauxite is :
[DCE 2004]
(a)
2
SiO (b)
2 3
FeO
(c)
2 4
(d) NaF
7. In the froth floatation process for the purification
of ores, the ore particles float because
[MP PMT 1984; NCERT 1981; CPMT 1987;
MNR 1992; UPSEAT 2002]
(a) They are light
(b) Their surface is not easily wetted by water
(c) They bear electrostatic charge
(d) They are insoluble
8. Difference in density is the basis of
[Kerala (Med.) 2002]
(a) Ultrafiltration
(b) Molecular sieving
(c) Gravity separation
(d) Molecular attraction
9. Mark the wrong statement
(a) Wrought iron is prepared by heating cast iron
in a reverberatory furnace
(b) The impurities present in cast iron are
oxidised by air
(c) The impurities are oxidised by
2 3
FeO
(d) CO burns with blue flame and the Si , Mn
and
other impurities form slag with silica
10. Thomas slag is [RPET 2003]
(a)
3
CaSiO (b)
3 42
Ca ( PO )
(c)
3
MnSiO (d)
3
CaCO
11. Which is correct [MADT Bihar 1995]
(a) Aluminium : Calamine
(b) Copper : Malachite
(c) Magnesium : Calamine
(d) Zinc : Carnellite
1. (d) 2. (b) Gold, Ag and Pt are called noble metals. They
are unreactive and found in free state.
3. (b) Copper metal is found in khetri region of
Rajasthan with that it is also found in
singhbhum and Hazaribagh district in Bihar,
Agnigundala in Andhra pradesh, Malanjkh in
4. (c) Saphire (Blue colour) is mineral of Al. 5. (c) Cryolite( )
3 6
NaAlF
6. (b) Red bauxite has chief imnpurity of
2 3
FeO.
7. (b) Ore particles are wetted by oil. Hence, float on
the surface.
8. (c) Levigation or gravity separation is used when
the ore particles are heavier than the earthy
or rocky gangue particles.
9. (b) The wrong statement is that the impurities
present in cast iron are oxidised by air.
10. (b) Thomas slag
3 42
Ca ( PO )
is used as a valuable
fertilizer.
11. (b) Malachite is an ore of copper.
Iron core
(Siderophil)
Different zones of the earth
Solid crust
Silicate layer
(Lithophil)
Sulphide layer
(Chalcophil)