The approximate amount of silica present in cement is:

Correct option is C

The correct answer is (c) between 17% and 25%

· This range is consistent with the typical composition of Portland cement, the most common type of cement used in construction.
· While the specific percentage can vary depending on the type and brand of cement, the range of 17% to 25% for silica is widely accepted.
· Silica (SiO2) is a major component of cement, typically constituting around 20% of its weight. It plays a crucial role in the hardening and strength development of the cement mixture.
· Composition of cement, includes:
· Lime (CaO): 50-60%
· Silica (SiO2): 17-25%
· Alumina (Al2O3): 4-8%
· Iron oxide (Fe2O3): 2-6%
· Other minor components: 1-5%