Q. The major component of portland cement is

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A

$S i O_{2}$

40%

B

$C a O$

42%

C

$A l_{2} O_{3}$

15%

D

$F e_{2} O_{3}$

4%

Solution:

% Composition : $C a O > S i O_{2} > A l_{2} O_{3} > F e_{2} O_{3}$