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General Principles of Isolation of Elements · Question 3

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 25% papers+4−1
1

Which one of the following is not a calcination reaction?

  1. CaCO3 + 2HCl CaCl2 + H2O + CO2
  2. ZnCO3 ZnO + CO2
  3. Fe2O3 . xH2O Fe2O3 + xH2O
  4. CaCO3 . MgCO3 CaO + MgO + 2CO2

Answer

(1) CaCO3 + 2HCl CaCl2 + H2O + CO2

Solution

Calcination is heating of an ore (carbonate or hydrated oxide) alone, in a limited supply of air, so that volatile matter (CO2, H2O) is removed.

Options (2), (3) and (4) are thermal decompositions of a carbonate or hydrated oxide calcination.

In option (1), CaCO3 reacts with another reagent, HCl an acid–base reaction, not calcination.

Answer: (1)

Out of syllabusNEET (UG) 2022 (Phase 2)

Keep practising — General Principles of Isolation of Elements

2

The maximum temperature that can be achieved in blast furnace is :

  1. Upto 5000 K
  2. Upto 1200 K
  3. Upto 2200 K
  4. Upto 1900 K
Out of syllabusNEET (UG) 2021
3

Which one of the following methods can be used to obtain highly pure metal which is liquid at room temperature?

  1. Zone refining
  2. Electrolysis
  3. Chromatography
  4. Distillation
Out of syllabusNEET (UG) 2021
4

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.
Out of syllabusNEET (UG) 2020
5

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
6

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
7

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
8

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)
9

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
10

"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)
11

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)

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