Question

Percentage of impurities in limestones should not exceed ________ for preparing fat lime.

(a) 5%

(b) 8%

(c) 10%

(d) 15%

This question was posed to me by my school principal while I was bunking the class.

This interesting question is from Lime topic in portion Glass, Lime, Clay Products & Bricks of Construction & Building Materials

Answer 1

Right choice is (a) 5%

Explanation: Fat lime is prepared by calcination of a comparatively pure carbonate of lime. It should be composed of about 95% calcium oxide. The percentage of impurities in limestones should not exceed 5% for preparing fat lime.