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General Principles of Isolation of Elements · Question 8

NEET 2018MCQEasy📈 Topic in 25% papers+4−1
1

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

  1. Fe
  2. Zn
  3. Mg
  4. Cu

Answer

(3) Mg

Solution

In an Ellingham diagram, a metal can reduce the oxide of another metal if its own oxide line lies below (more negative f G ) that of the other oxide.

The lines for FeO, ZnO and Cu2O lie above the Al2O3 line ⇒ Fe, Zn and Cu cannot reduce alumina.

The MgO line lies below the Al2O3 line (below the temperature at which the two lines cross).

3Mg + Al2O3 3MgO + 2Al

∴ Mg can reduce alumina.

Answer: (3)

Out of syllabusNEET 2018

Keep practising — General Principles of Isolation of Elements

2

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
3

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)
4

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
5

"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)
6

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)
7

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)
8

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)
9

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)
10

Which one of the following is a mineral of iron?

  1. Malachite
  2. Cassiterite
  3. Pyrolusite
  4. Magnetite
Out of syllabusAIPMT 2012 (Prelims)
11

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

  1. Fe2O3(s) + 3CO(g) 2Fe(l) + 3CO2(g)
  2. CaCO3(s) CaO(s) + CO2(g)
  3. CaO(s) + SiO2(s) CaSiO3(s)
  4. 2C(s) + O2(g) 2CO(g)
Out of syllabusAIPMT 2011 (Mains)

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