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General Principles of Isolation of Elements · Question 9

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

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

Answer

(3) displacement with Zn

Solution

As per NCERT, silver and gold are leached with a dilute solution of NaCN or KCN in the presence of air:

4Ag(s) + 8CN-(aq) + 2H2O(aq) + O2(g) 4[Ag(CN)2]-(aq) + 4OH-(aq)

The metal is later recovered by displacement with zinc, a more reactive metal:

2[Ag(CN)2]-(aq) + Zn(s) [Zn(CN)4]2-(aq) + 2Ag(s)

Answer: (3)

Out of syllabusNEET 2017

Keep practising — General Principles of Isolation of Elements

2

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)
3

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
4

"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)
5

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)
6

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)
7

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)
8

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)
9

Which one of the following is a mineral of iron?

  1. Malachite
  2. Cassiterite
  3. Pyrolusite
  4. Magnetite
Out of syllabusAIPMT 2012 (Prelims)
10

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)
11

Which of the following elements is present as the impurity to the maximum extent in pig iron?

  1. Manganese
  2. Carbon
  3. Silicon
  4. Phosphorus
Out of syllabusAIPMT 2011 (Prelims)

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