Which substance is used to retard the setting action of cement?
CaSO4. 2H2O (gypsum) is added to cement clinker to retard setting action of cement.
Which one of the following is not present in cement?
Gypsum is added in calculated quantity in order to adjust the rate of setting of cement. Alum is NOT present in cement.
What is the reason for white cement to be white?
White cement is white since it does not contain iron.
Which one of the following is not contained in portland cement ?
A typical composition for portland cement is CaO, SiO2, Al2O3, Fe2O3, CaSO4.2H2O.
∴ Ca3(PO4)2 is not contained in portland cement.
Soaps are sodium salts of fatty acids. Which of the following fatty acid does not form soap?
Soft soaps are
Potash (Potassium carbonate) is used as a fertilizer. It is also known as
Glass is a transparent substance obtained by heating silica with oxides or carbonates of metals. Glass is a mixture of
When glass is heated, it