Question

The number of compounds present in Portland cement from the following is \[ \mathrm{MgO,\ CaO,\ MgCO_3,\ MgCl_2,\ Al_2O_3,\ SO_3,\ SiO_2,\ CaSO_4,\ Fe_2O_3,\ CaCl_2} \]

• A. \(6\)
• B. \(4\)
• C. \(5\)
• D. \(7\)

Hint:

Major constituents of Portland cement are \[ \boxed{ \mathrm{CaO,\ SiO_2,\ Al_2O_3,\ Fe_2O_3,\ MgO,\ SO_3}. } \] Gypsum \((\mathrm{CaSO_4\cdot2H_2O})\) is added separately to regulate the setting time.

Answer 1

The Correct Option is A

Step 1: Identify the constituents of Portland cement. The important constituents of Portland cement are \[ \mathrm{CaO,\ SiO_2,\ Al_2O_3,\ Fe_2O_3,\ MgO,\ SO_3.} \]

Step 2: Count the compounds from the given list. Present in Portland cement: \[ \mathrm{MgO,\ CaO,\ Al_2O_3,\ SO_3,\ SiO_2,\ Fe_2O_3} \] Total number of compounds \[ \boxed{6} \] Hence, \[ \boxed{(A)} \] is the correct answer.