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Which of the following is the constituent of good brick earth whose excess census the raw brick shrink and warp during drying and burning?

Which of the following is the constituent of good brick earth whose excess census the raw brick shrink and warp during drying and burning? Correct Answer Alumina

Explanation:

Good Brick Earth Constituents table:

Constituents Percentage Properties Impart Excess causes
Alumina    20 - 30 Plasticity Shrinking and warping
Silica 50 - 60 Uniform shape  Makes brick Brittle
Lime 4 - 5 Prevent cracking and shrinkage Causes the bricks to melts.
Oxide of Iron 5 - 6 Imparts red-brown color and strength. Makes bricks dark blue and blackish.
Magnesia < 1  Yellow tint color to brick. Decay of brick.

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