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Select the statement which is correct?

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In Ellingham diagram $M \to MO$ curves are having negative slope.

$MgO$ can be reduced by carbon at very high temperature $(\approx 1800^{\circ} C)$

In blast furnace, carbon does not reduce iron oxides

Extraction of metals are based upon oxidation reactions mainly.

answer is B.

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Detailed Solution

Magnesium oxide can be reduced by carbon at very high temperature $(\approx {(1800)}^{\circ} C)$

The lowest temperature necessary for the reduction of MgO by carbon is 1600 K because, at this temperature, $ΔG$ for the formation of CO₂ is more negative than it is for the formation of MgO.

Hence the correct option is B

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