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-02 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Conversion of ore to oxide is generally carried out by the process of
  • A
    Roasting
  • B
    Smelting
  • C
    Calcinations
  • D
    Both (a) and (b)
    Correct
2
Pyrometallurgy is the process of
  • A
    Reduction of the oxide to the metal
    Correct
  • B
    Concentration of ore
  • C
    Conversion of ore to its oxide
  • D
    Purification of ore
3
The process in which the concentrated ore is heated to a high temperature in the absence of air is known as
  • A
    Reduction
  • B
    Smelting
  • C
    Calcinations
    Correct
  • D
    Roasting
4
${\text{ZnC}}{{\text{O}}_{\text{3}}}(s)\xrightarrow{\Delta }{\text{ZnO(s) + C}}{{\text{O}}_{\text{2}}}$;The reaction shows the process of
  • A
    Reduction
  • B
    Smelting
  • C
    Calcination
    Correct
  • D
    Roasting
5
What is the temperature of zone of slag formation?
  • A
    Above 1500 $^oC$
  • B
    600 – 900$^oC$
  • C
    900 – 1000$^oC$
  • D
    1000 – 1300 $^oC$
    Correct
6
In extraction of gold and silver, the metals is leached into aqueous solution using
  • A
    Hydroxide ion
  • B
    Oxalate ion
  • C
    Cyanide ion
    Correct
  • D
    Sulphate ion
7
Liquation method is used for the metals which have
  • A
    Low melting points
    Correct
  • B
    High boiling points
  • C
    Low boiling points
  • D
    High melting points
8
Ultrapurification method is used for
  • A
    Au
  • B
    Fe
  • C
    Sn
  • D
    Ge
    Correct
9
Which metal is used in paints and lacquers?
  • A
    Cu
  • B
    Zn
  • C
    Al
    Correct
  • D
    Fe
10
Extraction process of Bauxite is known as
  • A
    Hall – Heroult process
    Correct
  • B
    Van – Arkel – de Boer process
  • C
    Mond’s process
  • D
    Cynanide process
11
Which among the following ores are not found on earth’s crust?
  • A
    Nitrides
    Correct
  • B
    Halides
  • C
    Sulphides
  • D
    Oxides
12
Which metal ores occur in lakes and sea?
  • A
    Oxides
  • B
    Halides
    Correct
  • C
    All of these
  • D
    Sulphides
13
Cassiterite is the chief ore of
  • A
    Sn
    Correct
  • B
    Cu
  • C
    Al
  • D
    Fe
14
Cinnabar is an ore of
  • A
    Mercury
    Correct
  • B
    Copper
  • C
    Lead
  • D
    Zinc
15
The Wilfley table is used in the process of
  • A
    Hydraulic washing
    Correct
  • B
    Froth floatation
  • C
    Magnetic separation
  • D
    Leaching