Chemistry - General Principles and Process of Isolation of Elements

Question - 1

Metals generally occur in the native form due to their

  • A high electronegativity
  • B low density
  • C low reactivity
  • D high reactivity

Question - 2

Most abundant element in earth's crust  ( in terms of number of atoms per 100 atoms) is

  • A Al
  • B Si
  • C O
  • D H

Question - 3

Sphalerite and siderite are the ores of the metals

  • A Cu and Fe
  • B Zn and Cu
  • C Zn and Fe
  • D Zn and Al

Question - 4

Lighter gangue particles are removed by washing in a current of water is called.

  • A liquation
  • B levigation
  • C cupellation
  • D leaching

Question - 5

Chemical used as a depressant in separating ZnS from PbS in froth floatation process is

  • A NaCN
  • B NaCl
  • C BaCl2
  • D ZnSO4

Question - 6

Which of the following ore is not concentrated by froth floatation process?

  • A Pyrolusite
  • B Pentlandite
  • C Zinc blende
  • D Copper pyrites

Question - 7

How do we separate two sulphide ores by froth floatation method?

  • A By adding pine oil
  • B By adding sodium cyanide
  • C By adding foaming agent
  • D By passing air

Question - 8

Copper pyrites is concentrated by

  • A gravity method
  • B froth floatation process
  • C electromagnetic method
  • D All of the above

Question - 9

Cassiterite is concentrated by

  • A liquation
  • B floatation
  • C electromagnetic separation
  • D levigation

Question - 10

The roasting reaction in the metallurgy of Cu is

  • A CuFeS2 \({ \rightarrow } \) CuO
  • B 2CuFeS2 + O2 \({ \rightarrow } \) Cu2S + 2FeS + SO2
  • C CuFeS2  \({ \rightarrow } \) Cu2O+ Fe2O3+SO2
  • D None of the above
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