a) 5,00,000 kg
b) 4,00,000 kg
c) 4,50,000 kg
d) None of these
Answer: b
Explanation: Let 100 kg of hematite be obtained then 20% of it get wasted that means 80 kg of ore remains.
Pure iron = 25% of remaining ore = $$\frac{{80 \times 25}}{{100}} = 20\,{\text{kg}}$$
20 kg pure Iron is obtained from 100 of hematite
1 kg pure Iron is obtained from = $$\frac{{100}}{{20}}$$ hematite
80000 kg pure Iron is obtained from =$$\,\frac{{100}}{{20}} \times 80000 = \,$$ $$400000\,{\text{kg}}$$ hematite.
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