Q16 / 160 · AP EAMCET 2022 (05 Jul Shift 1) · Chemistry

The two major constituents of Portland cement are

  • Correct answer
    A
    $\mathrm{CaO}, \mathrm{SiO}_2$
  • B
    $\mathrm{CaO}, \mathrm{Al}_2 \mathrm{O}_3$
  • C
    $\mathrm{SiO}_2, \mathrm{MgO}$
  • D
    $\mathrm{CaO}, \mathrm{MgO}$

Solution

The portland cement consists of tricalcium silicate $(3 \mathrm{CaO} \cdot \mathrm{SiO}_2)$, dicalcium silicate $\left(2 \mathrm{CaO} \cdot \mathrm{SiO}_2\right)$, tricalcium aluminate $\left(3 \mathrm{CaO} \cdot \mathrm{Al}_2 \mathrm{O}_3\right)$ and tetra-calcium aluminoferrite $\left(4 \mathrm{CaO} \cdot \mathrm{Al}_2 \mathrm{O}_3 \cdot \mathrm{Fe}_2 \mathrm{O}_3\right)$. Hence, the major constituent in it is $\mathrm{CaO}$ and $\mathrm{SiO}_2$. The percentage of $\mathrm{CaO} \approx 64 \%$ and $\mathrm{SiO}_2$ is $21 \%$.

Hence, the correct answer is option: 'A'.

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