676 General Principles of Extraction of Metals
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)
32OFe
(c)
42SOK
(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
32OFe
(d)
CO
burns with blue flame and the
MnSi,
and
other impurities form slag with silica
10. Thomas slag is [RPET 2003]
(a)
3
CaSiO
(b)
243 )(POCa
(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
