Which of the following reactions is an example of autoreduction?

Question

Which of the following reactions is an example of autoreduction? (A) Fe3O4 + 4CO → 3Fe + 4CO2 (B) Cu2O + C → 2Cu + CO (C) Cu2+(aq) + Fe(s) → Cu(s) + Fe2+(aq) (D) Cu2O + (1/2) Cu2S → 3Cu + (1/2) SO2

Tardigrade Admin · Accepted Answer

The sulphide ores of certain less electropositive metals like those of

H g

,

P b

,

C u

, 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 metal 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 + 2 S O_{2}

2 C u_{2} O + C u_{2} S \to 6 C u + S O_{2}

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

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

$C u_{2} O + C \to 2 C u + CO$

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

$C u_{2} O + \frac{1}{2} C u_{2} S \to 3 C u + \frac{1}{2} S O_{2}$

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

Fe3​O4​+4CO→3Fe+4CO2​

Cu2​O+C→2Cu+CO

Cu(aq)2+​+Fe(s)​→Cu(s)​+Fe(aq)2+​

Cu2​O+21​Cu2​S→3Cu+21​SO2​

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

$C u_{2} O + C \to 2 C u + CO$

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

$C u_{2} O + \frac{1}{2} C u_{2} S \to 3 C u + \frac{1}{2} S O_{2}$