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The raw materials used for the manufacture of Portland cement are

Options

  1. ALime, silica and sulphur dioxide
  2. BLime, silica and carbon dioxide
  3. CLime, silica and alumina
  4. DLime, silica and boric acid

Correct answer

C. Lime, silica and alumina

Step-by-step solution

Limestone and clay or shale (bulk of the silica, alumina and ferric oxide) are the main constituents of Portland cement.

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