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Q: How much should be the maximum % impurities in limestone allowed for fat lime?
  • A. 15%
  • B. 12%
  • C. 5%
  • D. 10%
Correct Answer: Option C - Fat lime– It is soft lime obtained by the calcinations of nearly pure lime stone, marble, white chalk and calcareous Tufa also known as white washing lime should not have impurities of clay and stone more than 5%.
C. Fat lime– It is soft lime obtained by the calcinations of nearly pure lime stone, marble, white chalk and calcareous Tufa also known as white washing lime should not have impurities of clay and stone more than 5%.

Explanations:

Fat lime– It is soft lime obtained by the calcinations of nearly pure lime stone, marble, white chalk and calcareous Tufa also known as white washing lime should not have impurities of clay and stone more than 5%.