Identify the correct statement from the following : [ NEET 2020]
32%
a) Vapour phase refining is carried out for Nickel by Van Arkel method.
41%
b) Pig iron can be moulded into a variety of shapes.
6%
c) Wrought iron is impure iron with 4% carbon.
21%
d) Blister copper has blistered appearance due to evolution of CO2.
Q.2.
Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by ...[ NEET 2017]
15%
a) liquation
21%
b) distillation
18%
c) zone refining
47%
d) displacement with Zn
Q.3.
match the items of Column I with the items of ColumnII and assign the correct code [ NEET 2016 ,PahseII]
Column I
Column II
A. Cyanide process
Ultrapure Ge
B. Froth floatation process
Dressing of ZnS
C. Electrolytic reduction
Extraction of Al
D. Zone refining
Extraction of Au
Purification of Ni
10%
a) A → 2; B → 3; C → 1; D → 5
14%
b) A → 1; B → 2; C → 3; D → 4
17%
c) A → 3; B → 4; C → 5; D → 1
59%
d) A → 4; B → 2; C → 3; D → 1
Q.4.
Roasting of sulphides gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphure and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic acts as a reduing agent and its acid has never been insolated. The gas X is ... [ NEET 2013]
29%
a) H2S
67%
b) SO2
0%
c) CO2
4%
d) SO3
Q.5.
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of ... [ AIPMT 2012]
0%
a) Al2O3 + HF + NaAlF4
31%
b) Al2O3 + CaF2 + NaAlF4
62%
c) Al2O3 + Na3AlF6 + CaF2
8%
d) Al2O3 + KF + Na3AlF6
Q.6.
Assertion : Aluminium metal is used as a reducing agent in the extraction of chromium Reason: Reduction by aluminium is known as Gold-Schmidt aluminethermic process
33%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
52%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
10%
c) Assertion is true, but Reason is false
5%
d) Assertion and Reason are false
Q.7.
Which of the following elements is present as the impurity to the maximum extent in the pig iron? [ AIPMT 2011]
54%
a) carbon
12%
b) silicon
17%
c) phosphorus
17%
d) manganese
Q.8.
Which of the following pairs of metals is purified by van-Arkel method? [ AIPMT 2011]
62%
a) Zr and Ti
12%
b) Ag and Au
17%
c) Ni and Fe
8%
d) Ga and In
Q.9.
Sulphide ores of metals are usually concentrated by froth floatation process. Which one of the following sulphide ores offers an exception and is concentratioed by chemical leaching? [ AIPMT 2007] a) Argentite
19%
b) Galena
29%
c) copper pyrite
19%
d) sphalerite
33%
Explanation and answer
Q.10.
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true [AIPMT 2007]
35%
a) Carbon and hydrogen are suitable reducing agents for metal sulphides
25%
b) The ΔfG° of the sulphide is greater than those for CS2 and H2S
15%
c) The ΔfG° is negative for roasting of sulphide ore to oxide
25%
d) Roasting of the sulphide to the oxide is thermodynamically feasible
Q.11.
A solid compound X on heating gives CO2 gas and a residue. the residue mixed with water forms Y. On passing an excess of CO2 through Y in water, a clear solution Z is obtained. On boiling Z, compound X is reformed. The compound X is [ AIPMT 2004]
42%
a) Ca(HCO3)2
53%
b) CaCO3
0%
c) Na2CO3
5%
d) K2CO3
Q.12.
Assertion : AgNO3 is called lunar caustic. Reason: In contact with organic matter (skin, cloth, paper) AgNO3 is reduced to metallic silver
26%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
42%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
16%
c) Assertion is true, but Reason is false
16%
d) Assertion and Reason are false
Q.13.
The method of zone refining of metals is based on the principle of ...[ AIPMT 2003]
6%
a) greater noble character of the solid metal than that of the impurity
29%
b) greater solubility of the impurity in the molten state than in the soild
53%
c) higher melting point of the impurity than that of the pure metal
12%
d) greater mobility of the pure metal than that of impurity
Q.14.
Cassiterite is an ore of [ AIPMT 1999]
33%
a) Mn
6%
b) Ni
22%
c) Sb
39%
d) Sn
Q.15.
Purification of aluminium by electrolytic refining is known as ... [ AIPMT 1999]
28%
a) Hall's process
28%
b) Baeyer's process
33%
c) Hoope's process
11%
d) Serpeck's process
Q.16.
Which one of the following elements constitutes a major impurity in pig iron? [ AIPMT 1998]
24%
a) Silicon
12%
b) Oxygen
24%
c) Sulphur
41%
d) Graphite
Q.17.
Calcium is obtained by the ... [ AIPMT 1997]
16%
a) roasting of limestone
11%
b) electrolysis of solution of calcium chloride in H2O
47%
c) electrolysis of molten anhydrous calcium chloride
26%
d) reduction of calcium chloride with carbon
Q.18.
Assertion : SO2 is used to remove impurities of CaO in an ore Reason: SiO2 is an acidic flux
25%
a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
55%
b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
15%
c) Assertion is true, but Reason is false
5%
d) Assertion and Reason are false
Q.19.
Elemental silicon to be used as a semiconductor is purified by [ AIPMT 1996]
10%
a) heating under vacuum
20%
b) floatation
60%
c) zone refining
10%
d) electrolysis
Q.20.
Calgon used as a water softner is [ AIPMT 1989]
26%
a) Na2[Na4(PO3)6]
37%
b) Na4[Na2(PO3)6]
26%
c) Na4[Na4(PO4)5]
11%
d) Na4[Na2(PO4)6]
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