1.

The presence of which of the below renders clay totally unsuitable for brick manufacture?(a) Kallar(b) Kankar(c) Hay(d) Lime

Answer» The correct choice is (a) Kallar

Easy explanation: Kallar or Reh consists of sodium sulphate.  Bricks do not burn properly in its presence.  After burning, it causes the surface of brick to peel off and crumble later on.


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