Which of the following is reactions is an example of autoreduction?

F e_{3} O_{4} + 4 C O \to 3 F e + 4 C O_{2}

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C u O + C \to 2 C u + C O

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C u_{(a q)}^{2 +} + F e_{(s)} \to C u_{(s)} + F e_{(a q)}^{(2 +)}

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C u_{2} O + \frac{1}{2} C u_{2} S \to 2 C u + \frac{1}{2} S O_{2}

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Solution

The correct option is D $C u_{2} O + \frac{1}{2} C u_{2} S \to 2 C u + \frac{1}{2} S O_{2}$
The sulphide ores of certain less electropositive metals like those of Hg, Pb, Cu, etc. when heated in air bring about the conversion of a part of the sulphide ore to oxide or sulphate which then reacts with the remaining sulphide to give the matal and $S O_{2}$ . No external reducing agent is used in this process.
$2 C u_{2} S + 3 O_{2} \to 2 C u_{2} O + 3 S O_{2}$
$2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}$

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Similar questions

C u_{(s)} \to C u_{(a q)}^{2 +} + 2 e^{-}; E^{o} = - 0.325 V

C u_{(a q)}^{+} + e^{-} \to C u_{(s)}; E^{o} = 0.50 V

E^{o}

2 C u_{(a q)}^{+} \to C u_{(a q)}^{2 +} + C u_{(s)}

{C u}^{+} (a q)

2 {C u}^{+} (a q) ⇌ {C u}^{2 +} (a q) + C u (s)

E^{o}

E_{{C u}^{2 +} / C u}^{o} = 0.34 V

E_{{C u}^{2 +} / {C u}^{+}}^{o} = 0.15 V

C u^{+}

2 C u^{+} (a q) \to C u (s) + C u^{2 +} (a q)

2 C u_{(a q)}^{+} \to C u_{(s)} + C u_{(a q)}^{2 +}

0.36 V .

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