📊 Chemical Engineering Basics
Q. Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is
  • (A) 5CaO . 3Al2O3
  • (B) 3CaO . Al2O3
  • (C) 3CaO . SiO2
  • (D) 2CaO . SiO2
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✅ Correct Answer: (A) 5CaO . 3Al2O3

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