Which of the following is not and alloy of aluminum?
  • Duralumin
  • Magnalium
  • Alnico
  • All are alloys of aluminum
German silver is an alloy of
  • Cu and Ni
  • Cu, Sn and Ag
  • Cu,Zn and Ni
  • Cu,Ni Fe and Mn
Alloys are a homogeneous mixture of
  • metals only
  • None of these
  • metals or metals and non-metals
  • non-metals only
Anode mud is obtained in which process?
  • Zone refining
  • Calcination
  • Electrolytic refining
  • Roasting
Which of the following properties is not a characteristic of metals?
  • Metallic lusture
  • Hardness
  • High density
  • Low melting and boiling point
Carnallite is
  • \(KCl,MgCl_2,H_2O\)
  • \(KCl,MgCl_2,3H_2O\)
  • \(KCl,MgCl_2\)
  • \(KCl,MgCl_2,6H_2O\)
Which of the following is most abundant metal on the earth’s crust?
  • Calcium
  • Iron
  • Aluminum
  • Oxygen
What is the decreasing order of reactivity of following metals? \(Na, \, Al,/, Cu, \,  Ag, \,  Fe\)
  • \(K>Na>AI>Fe>Ag>Cu\)
  • \(K>Na>AI>Cu>Fe>Ag\)
  • \(K>Na>AI>Fe>Cu>Ag\)
  • \(Na>K>AI>Cu>Ag>Fe\)
Ionic bond is formed by
  • sharing of electrons
  • Loss of electrons only
  • Loss and gain of electrons both
  • Gain of electrons only
Greenish coating that develops on copper utensils is due to formation of
  • \(Cu(OH)_2 \cdot CuCO_3\)
  • \(Cu(OH)_2\)
  • \( CuCO_3\)
  • \(CuO\)
Chemical rust is
  • hydrated ferric oxide
  • hydrated ferrous oxide
  • only ferric oxide
  • None of these
Which method is used in purification of mercury?
  • Electrolytic refining
  • Chemical reduction
  • Liquation
  • Distillation
\(Zn+H_2O\left( steam \right) \rightarrow A+B\) In the above equation \(A\) and \(B\) are
  • \(ZnH_2 \text{ and } O_2\)
  • \(ZnO \text{ and } H_2\)
  • \(ZnO_2 \text{ and } O_2\)
  • \(Zn \text{ and } H_3\)
Which of the following methods is based on the principle of the difference in the wetting properties of the ore and gangue particles with water and oil
  • Magnetic separation
  • Front floatation process
  • Hydraulic washing
  • None of these
For purification of which metal, liquation method is used?
  • All of these
  • Tin
  • Bismuth
  • Lead
Which of the following is/are oxide ore(s)?
  • Bauxite
  • Cuprite
  • Hematite
  • All of these
Octet rule was given by
  • Lewis and Kossel
  • Rutherford
  • Soddy
  • None of these
During formation of iconic bond
  • There is force of attraction between positive and negative ions
  • There is force of repulsion between two positive ions
  • There is force of repulsion between two negative ions
  • none of these
Which of the following methods is used for obtaining metals of very high purity?
  • Liquation
  • Distillation
  • Electrolytic refining
  • Zone refining
Forth floatation method is used for the concentration of
  • suphate ores
  • halide ores
  • oxide ores
  • sulphide ores
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