How many statements are correct about following diagram? (A) Carbon can be used to reduce the metal oxide and itself oxidised into carbondioxide at only above the T 3 temperature. (B) Carbon can be

Question

How many statements are correct about following diagram?

(A) Carbon can be used to reduce the metal oxide and itself oxidised into carbondioxide at only above the $T_{3}$ temperature.

(B) Carbon can be used to reduce the metal oxide and itself oxidised into carbonmonoxide at above $T_{1}$ temperature.

(C) Carbon monoxide can reduce the metal oxide to the metal and is oxidised to carbondioxide at above $T_{3}$ temperature.

(D) Carbon can be used to achieve the reduction for metal oxide below the $T_{2}$ temperature and carbon is oxidised to carbondioxide. (E) $T_{4}$ is the melting point of metal

TestHub · Accepted Answer

Statement (B) is correct: Above temperature $T_{1}$ , the $Δ G^{\circ}$ line for $C \to CO$ lies below the metal oxide line, meaning carbon reduces the metal oxide to metal and oxidizes to carbon monoxide ( $CO$ ).

Statement (D) is correct: Below temperature $T_{2}$ , carbon can reduce the metal oxide while being oxidized to carbon dioxide ( $C O_{2}$ ), as its free energy line is more negative.

Statement (E) is correct: The sudden upward kink in the metal oxide line at temperature $T_{4}$ indicates a phase change (increase in entropy of the reactant), which represents the melting point of the metal.

Statements (A) and (C) are incorrect because carbon monoxide ( $CO$ ) acts as a better reducing agent below $T_{3}$ , not above it.

Chemistry - Metallurgy Question with Solution | TestHub

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