Question

Match the properties and uses of alloys in List 1 with the appropriate answer from List 2.

List 1:
  1. The alloy contains Cu and Zn, is hard and is used in decorative articles.
  2. It is stronger than Aluminium, light and is used in making light tools.
  3. It is lustrous, hard, corrosion resistant and used in surgical instruments.
  4. Tin lowers the melting point of the alloy and is used for soldering purpose.
  5. The alloy is hard, brittle, takes up polish and is used for making statues.

List 2 :
(A) Duralumin
(B) Brass
(C) Bronze
(D) Stainless steel
(E) Solder

  • Metallurgy
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Answer

The alloy contains Cu and Zn, is hard and is used in decorative articles. (B) Brass
It is stronger than Aluminium, light and is used in making light tools. (A) Duralumin
It is lustrous, hard, corrosion resistant and used in surgical instruments. (D) Stainless steel
Tin lowers the melting point of the alloy and is used for soldering purpose. (E) Solder
The alloy is hard, brittle, take up polish and is used for making statues. (C) Bronze

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Give reasons for the following pertaining to Hall Herault’s process.
(i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction.
(ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar.
(iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes.
(iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.

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