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General Principles of Isolation of Elements · Question 6

NEET (UG) 2020MCQMedium📈 Topic in 25% papers+4−1
1

Identify the correct statement from the following :

  1. Blister copper has blistered appearance due to evolution of CO2
  2. Vapour phase refining is carried out for Nickel by Van Arkel method.
  3. Pig iron can be moulded into a variety of shapes.
  4. Wrought iron is impure iron with 4\% carbon.

Answer

(3) Pig iron can be moulded into a variety of shapes.

Solution

(1) The blistered appearance of blister copper is due to the evolution of SO2, not CO2 ⇒ incorrect.

(2) Nickel is refined by Mond process; Van Arkel method is used for zirconium and titanium ⇒ incorrect.

(3) As per NCERT, the iron obtained from the blast furnace contains about 4% carbon and many impurities in smaller amounts; it is known as pig iron and can be moulded into a variety of shapes ⇒ correct.

(4) Wrought iron (malleable iron) is the purest form of commercial iron; pig iron contains about 4% carbon ⇒ incorrect.

Answer: (3)

Out of syllabusNEET (UG) 2020

Keep practising — General Principles of Isolation of Elements

2

Which one is malachite from the following?

  1. Fe3O4
  2. CuCO3 Cu(OH)2
  3. CuFeS2
  4. Cu(OH)2
Out of syllabusNEET (UG) 2019
3

Considering Ellingham diagram, which of the following metals can be used to reduce alumina?

  1. Fe
  2. Zn
  3. Mg
  4. Cu
Out of syllabusNEET 2018
4

Extraction of gold and silver involves leaching with CN- ion. Silver is later recovered by

  1. distillation
  2. zone refining
  3. displacement with Zn
  4. liquation
Out of syllabusNEET 2017
5

Match items of Column I with the items of Column II and assign the correct code :

  1. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  2. (a)-(iii), (b)-(iv), (c)-(v), (d)-(i)
  3. (a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
  4. (a)-(ii), (b)-(iii), (c)-(i), (d)-(v)
Out of syllabusNEET 2016 (Phase 1)
6

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

  1. carbon monoxide
  2. copper (I) sulphide
  3. sulphur dioxide
  4. iron (II) sulphide
Out of syllabusAIPMT 2015
7

"Metals are usually not found as nitrates in their ores." Out of the following two (I and II) reasons which is/are true for the above observation? I. Metal nitrates are highly unstable. II. Metal nitrates are highly soluble in water.

  1. I is false but II is true.
  2. I is true but II is false.
  3. I and II are true.
  4. I and II are false
Out of syllabusAIPMT 2015 (Cancelled)
8

The metal oxide which cannot be reduced to metal by carbon is

  1. Al2O3
  2. PbO
  3. ZnO
  4. Fe2O3
Out of syllabusNEET 2013 (Karnataka)
9

The Gibbs energy for the decomposition of Al2O3 at 500 is as follows 23Al2O3 43Al + O2 rG = +960 kJ mol-1 The potential difference needed for the electrolytic reduction of aluminium oxide (Al2O3) at 500 is at least

  1. 4.5 V
  2. 3.0 V
  3. 2.5 V
  4. 5.0 V
AIPMT 2012 (Mains)
10

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with

  1. carbon monoxide
  2. copper (I) sulphide
  3. sulphur dioxide
  4. iron (II) sulphide.
Out of syllabusAIPMT 2012 (Prelims)
11

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of

  1. Al2O3 + HF + NaAlF4
  2. Al2O3 + CaF2 + NaAlF4
  3. Al2O3 + Na3AlF6 + CaF2
  4. Al2O3 + KF + Na3AlF6
Out of syllabusAIPMT 2012 (Prelims)

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