Heating with carbon in absence of air is known as:

The final step for the extraction of copper from copper pyrite in the Bessemer converter involves the reaction:

Which of the following metals is not obtained by electrolysis?

Flux is used to remove $........$.

Which of the following is used to reduce magnetite $(Fe_3O_4)$ to obtain iron?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ In an Ellingham diagram,the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.
Reason $R:$ $CO$ tends to get decomposed at higher temperature.
In the light of the above statements,choose the correct answer from the options given below: