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NDA 1 2024 GAT, question 65

Topic: Chemistry

Q65

Which among the following are essential constituents of Portland cement ?

  1. (a) Sand, lime, clay
  2. (b) Silica, alumina, limeCorrect answer
  3. (c) Silica, lime, graphite powder
  4. (d) Sand, graphene, clay

Solution.

Answer: (b) Silica, alumina, lime

  1. The principal oxide constituents of Portland cement include lime (CaO), silica (SiO₂) and alumina (Al₂O₃).
  2. These form the major calcium silicate and aluminate phases.
  3. Graphite and graphene are not essential constituents.