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Which of the following is not a chemical change that takes place in the brick earth during burning?

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in Basic Civil Engineering by (111k points)
Which of the following is not a chemical change that takes place in the brick earth during burning?

(a) Dehydration

(b) Vitrification

(c) Oxidation

(d) Reduction

The question was asked during an online interview.

Question is taken from Manufacture of Brick in section Materials for Construction of Basic Civil Engineering

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Correct choice is (d) Reduction

Explanation: During burning, no reduction reaction takes place.  Dehydration expels most of the water.  Oxidation results in the elimination of carbon and sulphur as oxides.  Vitrification is extreme reaction and occurs when heating above 900^oc.

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