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Lime stone acts as a flux in a cupola. It is generally added in the proportion

[A].	10 kg of limestone per tonne of iron	[B].	30 kg of limestone per tonner of iron
[C].	100 kg of limestone per tonne of iron	[D].	500 kg of limestone per tonne of coke
[E].	One tonne of limestone per tonne of charge

Answer: Option C