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General Principles of Isolation of Elements · Question 24

AIPMT 2003MCQEasy📈 Topic in 0% papers+4−1
1

The method of zone refining of metals is based on the principle of

  1. greater mobility of the pure metal than that of the impurity
  2. higher melting point of the impurity than that of the pure metal
  3. greater noble character of the solid metal than that of the impurity
  4. greater solubility of the impurity in the molten state than in the solid

Answer

(4) greater solubility of the impurity in the molten state than in the solid

Solution

As per NCERT, zone refining is based on the principle that the impurities are more soluble in the melt than in the solid state of the metal.

⇒ A circular heater moves along the rod; as the molten zone moves forward, pure metal crystallises out behind it and the impurities pass on into the adjacent molten zone.

⇒ Repeating the process sweeps the impurities to one end, which is cut off.

∴ Zone refining depends on the greater solubility of the impurity in the molten state than in the solid.

Answer: (4)

Out of syllabusAIPMT 2003

Keep practising — General Principles of Isolation of Elements

2

The reaction that does NOT take place in blast furnace between 900 K to 1500 K temperature range during extraction of iron is :

  1. FeO+CO Fe+CO2
  2. C+CO2 2CO
  3. CaO+SiO2 CaSiO3
  4. Fe2O3+CO 2FeO+CO2
Out of syllabusNEET (UG) 2023
3

Match List - I with List - II. Choose the correct answer from the options given below:

  1. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)
  2. (a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)
  3. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  4. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)
Out of syllabusNEET (UG) 2022
4

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
Out of syllabusNEET (UG) 2022 (Phase 2)
5

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
6

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
7

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
8

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
9

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
10

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
11

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)

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