Q.1
Identify the correct statement from the following : [ NEET 2020]
  • a) Vapour phase refining is carried out for Nickel by Van Arkel method.
  • b) Pig iron can be moulded into a variety of shapes.
  • c) Wrought iron is impure iron with 4% carbon.
  • 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]
  • a) liquation
  • b) distillation
  • c) zone refining
  • 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
  • a) A → 2; B → 3; C → 1; D → 5
  • b) A → 1; B → 2; C → 3; D → 4
  • c) A → 3; B → 4; C → 5; D → 1
  • 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]
  • a) H2S
  • b) SO2
  • c) CO2
  • d) SO3
Q.5
Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of ... [ AIPMT 2012]
  • a) Al2O3 + HF + NaAlF4
  • b) Al2O3 + CaF2 + NaAlF4
  • c) Al2O3 + Na3AlF6 + CaF2
  • 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
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • 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]
  • a) carbon
  • b) silicon
  • c) phosphorus
  • d) manganese
Q.8
Which of the following pairs of metals is purified by van-Arkel method? [ AIPMT 2011]
  • a) Zr and Ti
  • b) Ag and Au
  • c) Ni and Fe
  • 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
  • b) Galena
  • c) copper pyrite
  • d) sphalerite
  • 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]
  • a) Carbon and hydrogen are suitable reducing agents for metal sulphides
  • b) The ΔfG° of the sulphide is greater than those for CS2 and H2S
  • c) The ΔfG° is negative for roasting of sulphide ore to oxide
  • 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]
  • a) Ca(HCO3)2
  • b) CaCO3
  • c) Na2CO3
  • 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
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • d) Assertion and Reason are false
Q.13
The method of zone refining of metals is based on the principle of ...[ AIPMT 2003]
  • a) greater noble character of the solid metal than that of the impurity
  • b) greater solubility of the impurity in the molten state than in the soild
  • c) higher melting point of the impurity than that of the pure metal
  • d) greater mobility of the pure metal than that of impurity
Q.14
Cassiterite is an ore of [ AIPMT 1999]
  • a) Mn
  • b) Ni
  • c) Sb
  • d) Sn
Q.15
Purification of aluminium by electrolytic refining is known as ... [ AIPMT 1999]
  • a) Hall's process
  • b) Baeyer's process
  • c) Hoope's process
  • d) Serpeck's process
Q.16
Which one of the following elements constitutes a major impurity in pig iron? [ AIPMT 1998]
  • a) Silicon
  • b) Oxygen
  • c) Sulphur
  • d) Graphite
Q.17
Calcium is obtained by the ... [ AIPMT 1997]
  • a) roasting of limestone
  • b) electrolysis of solution of calcium chloride in H2O
  • c) electrolysis of molten anhydrous calcium chloride
  • 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
  • a) Both Assertion and Reason are true and the Reason is correct explanation of Assertion
  • b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
  • c) Assertion is true, but Reason is false
  • d) Assertion and Reason are false
Q.19
Elemental silicon to be used as a semiconductor is purified by [ AIPMT 1996]
  • a) heating under vacuum
  • b) floatation
  • c) zone refining
  • d) electrolysis
Q.20
Calgon used as a water softner is [ AIPMT 1989]
  • a) Na2[Na4(PO3)6]
  • b) Na4[Na2(PO3)6]
  • c) Na4[Na4(PO4)5]
  • d) Na4[Na2(PO4)6]
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