Question

Carbon monoxide is more effective reducing agent than carbon below 983 K but above this temperature the reverse is true. If true enter 1 else 0.

• A. 1

Answer 1

The correct option is A 1
The three reactions are as :
$C_{\left(s\right)}+O_2\to C{O}_2$ .....(i)
$2C_{\left(s\right)}+O_2\to 2C{O}_2$ .....(ii)
$2CO+O_2\to 2C{O}_2$ .....(iii)
Below 983 K reaction $2CO+O_2\to 2C{O}_2$ is more favored due to more negative $\Delta$G value thus CO is better reducing agent than carbon.
Above 983 K, reaction $2C_{\left(s\right)}+O_2\to 2CO$ has more negative $\Delta G$ than oxidation of CO to $C{O}_2,$ so carbon will be better reducing agent.