General Principles And Processes Of Isolation Of Elementsy Test

General Principles And Processes Of Isolation Of Elementsy

This is general principles and processes of isolation of elementsy Test-01 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
In the froth floatation process for the concentration of ore, the particles float because
  • A
    Their surface is wetted with oil
    Correct
  • B
    They are insoluble
  • C
    They are light
  • D
    They reacts with oil
2
Which among the following act as forth stabilizer?
  • A
    Pine oil
  • B
    Aniline
    Correct
  • C
    Coal tar
  • D
    Sodium ethyl xanthate
3
Which among the following is a chemical process?
  • A
    Magnetic separation
  • B
    Gravity separation
  • C
    Leaching
    Correct
  • D
    Froth floatation
4
Impurities associated with Bauxite ore is/are
  • A
    All of the above
    Correct
  • B
    $Fe_2O_3$
  • C
    $TiO_2$
  • D
    $SiO_2$
5
Which among the following act as flux , if iron oxide is present as an impurity?
  • A
    MnO
  • B
    $H_2SO_4$
  • C
    NaOH
  • D
    $SiO_2$
    Correct
6
Which of the following metals cannot be extracted by smelting process?
  • A
    Fe
  • B
    Zn
  • C
    Pb
  • D
    Al
    Correct
7
The furnace which gives the highest temperature is
  • A
    Reverberatory furnace
  • B
    Muffle furnace
  • C
    Blast furnace
    Correct
  • D
    Electrical furnace
8
At 1123 K temperature in the blast furnace , CO reduces
  • A
    $Fe_2O_3$ to Fe
  • B
    Fe to FeO
  • C
    FeO to Fe
    Correct
  • D
    $Fe_2O_3$ to FeO
9
Which among the following is not a basic flux?
  • A
    CaO
  • B
    $CaCO_3$
  • C
    $SiO_2$
    Correct
  • D
    MgO
10
The distillation process is used for the purification of
  • A
    Hg
    Correct
  • B
    Sn
  • C
    Pb
  • D
    Cs
11
In the extraction of nickel by Mond’s process, the metal is obtained by
  • A
    Chemical reduction
  • B
    Thermal decomposition
    Correct
  • C
    Electrochemical reduction
  • D
    Electrolytic reduction
12
Blister copper is about
  • A
    60% Cu
  • B
    98% Cu
    Correct
  • C
    90% Cu
  • D
    30% Cu
13
Refining of silver is done by
  • A
    Poling
  • B
    Cupellation
    Correct
  • C
    Zone refining
  • D
    Liquation
14
Which among the following is a method of concentration of ore?
  • A
    Liquation
  • B
    Leaching
    Correct
  • C
    Smelting
  • D
    Poling
15
The slag obtained during the extraction of copper from copper pyrites is composed of
  • A
    $CuSiO_3$
  • B
    $SiO_2$
  • C
    $Cu_2S$
  • D
    $FeSiO_3$
    Correct