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The colour of ordinary clinker is grey chiefly because of

  • A.the carbon left from the fuel burnt
  • B.the gypsum added after burning
  • C.the alkalis condensed on the surface
  • D.the iron present in the ferrite phase

Answer: D

Removing the iron is how white cement is produced, which confirms that it is the source of the colour. Carbon is fully burnt in a properly run kiln and contributes nothing to the appearance. Colour is therefore a chemical rather than a combustion matter.

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