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Tutor II 

Q. For the manufacture of Portland cement, the proportions of raw materials used, are

(A) Lime 63% ; silica 22% ; other ingredients 15%
(B) Lime 22% ; silica 63% ; other ingredients 15%
(C) Silica 40% ; lime 40% ; other ingredients 20%
(D) Silica 70% ; lime 20% ; other ingredients 10%
Correct : Option (A)

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