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-04 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Which of the following ore contains both Mg and Ca?
  • A
    Dolomite
    Correct
  • B
    Talc
  • C
    Gypsum
  • D
    Epsomite
2
Metal halides are found in lakes and seas because
  • A
    They are heavier than water
  • B
    They are lighter than water
  • C
    They are insoluble in water
  • D
    They are soluble in water
    Correct
3
An ore has impurities which are lighter than the ore. The process used for the concentration of ore is
  • A
    Leaching
  • B
    Magnetic separation
  • C
    Froth floatation
  • D
    Hydraulic washing
    Correct
4
Leaching of gold is done by
  • A
    Metal sulphide
  • B
    Metal silicate
  • C
    Metal hydroxide
  • D
    Metal cyanide
    Correct
5
The reducing agent used in the blast furnace to reduce haematite to iron is
  • A
    Carbon
  • B
    Carbon dioxide
  • C
    Silica
  • D
    Carbon monoxide
    Correct
6
Which among the following reaction takes place in zone of heat absorption?
  • A
    $CaC{O_3}\xrightarrow{{1123K}}CaO + C{O_2}$
  • B
    all of these
  • C
    $C + {O_2} \to C{O_2}$
  • D
    ${\text{C}}{{\text{O}}_{\text{2}}} + C \to 2CO$
    Correct
7
Calamine is an ore of
  • A
    Lead
  • B
    Calcium
  • C
    Zinc
    Correct
  • D
    Magnesium
8
In blister copper, the blisters are formed due to passing out of
  • A
    $SO_2$ gas
    Correct
  • B
    $CO_2$ gas
  • C
    $N_2$ gas
  • D
    CO gas
9
For obtaining high purity metals, which of the following methods of refining is preferred?
  • A
    Poling
  • B
    Liquation
  • C
    Electrolytic method
  • D
    Zone refining
    Correct
10
The second most abundant metal on earth’s crust is
  • A
    Iron
    Correct
  • B
    Aluminium
  • C
    Copper
  • D
    Zinc
11
Which of the following chemical is used as a depressant in separating ZnS from PbS in froth floatation process?
  • A
    NaCl
  • B
    BaCl2
  • C
    NaCN
    Correct
  • D
    ZnSO2
12
When the impurity is silica, which of the following can be used as flux?
  • A
    All of these
    Correct
  • B
    $MgCO_3$
  • C
    CaO
  • D
    $CaCO_3$
13
What is the main composition of matte?
  • A
    CuO
  • B
    $Cu_2S$
    Correct
  • C
    $Cu_2O$
  • D
    CuS
14
Which of the following substance can be used for drying gases?
  • A
    $CaCO_3$
  • B
    $Na_2CO_3$
  • C
    $NaHCO_3$
  • D
    CaO
    Correct
15
In blast furnace, the highest temperature is in
  • A
    Fusion zone
  • B
    Combustion zone
    Correct
  • C
    Slag zone
  • D
    Reduction zone