JEE Main 2022 · 29 Jul · Shift 2 · Chemistry Q68

ChemistrySingle correct+4 / -1Question 68 of 90

Portland cement contains 'X' to enhance the setting time. What is 'X'?

\mathrm{CaSO_4\cdot\frac12H_2O}

\mathrm{CaSO_4\cdot2H_2O}

\mathrm{CaSO_4}

\mathrm{CaCO_3}

Answer and worked solution

Official answer: B

Gypsum (CaSO₄·2H₂O) is added to clinker to slow the setting and so give workable time.

(B)

Topics:Important compounds of s-block

JEE Main 2022 · 29 Jul · Shift 2, Chemistry question 68