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The magnetite catalysts are reduced to what?

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The magnetite catalysts are reduced to what?

(a) Metallic iron

(b) Metallic copper

(c) Metallic zinc

(d) All of the mentioned
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The correct answer is (a) Metallic iron

Easiest explanation: The magnetite catalysts are generally reduced to metallic iron with pure hydrogen at space velocities of 2,000  hr’-1 and at 400-500°C.
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