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Question
Clay bricks are made of earth having 
e`fÙkdk dh bZaV ftl feV~Vh ls cukbZ tkrh gS] mlesa D;k gksrk gS\ 
A.
Nearly equal proportion of silica and alumina
B.
Nearly equal proportions of alumina, silica and  lime
C.
35 - 70% silica and 10 - 20% alumina
D.
10 - 20% silica and 35 - 70% alumina    
Answer ( Option C)

35 - 70% silica and 10 - 20% alumina

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