Question

The percentage of iron oxide in the clay taken to manufacture terra-cotta is ________

(a) 1-3%

(b) 5-8%

(c) 12-15%

(d) 17-20%

I had been asked this question by my school principal while I was bunking the class.

My doubt stems from Clay Products in chapter Glass, Lime, Clay Products & Bricks of Construction & Building Materials

Answer 1

The correct option is (b) 5-8%

The best explanation: The percentage of iron oxide in the clay taken to manufacture terra-cotta is 5-8%. However, the proportion of lime should be about 1%.