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

The percentage of iron oxide in the clay taken to manufacture terra-co

1.	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» 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%.

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