Write the average composition of Portland cement.

The average composition of portland cement is

Match column-I with column-II regarding the avergae composition of portland cement {:("Column-I (Material)", "Column -II (Average composition%)"), ("a) silica", "p) 1.8%"), ("b) Haematitte", "q) 7%"), ("c) Quick lime", "r) 23%"), ("d) Alumina", "s) 56%"):}

Portland cement is:

What is the composition of portland cement ?

Give: The average composition of cells.

Write the composition of cement .

Correct matching about composition of portland cement is {:("List - I","List - II"),("I) "Al_(2)O_(3),"A) "50-60%),("II) "CaO,"B) "20-25%),("III) "SiO_(2),"C) "5-10%),("IV) "MgO,"D) "2-3%):}