Which iron ore is reduced in a blast furnace to obtain iron metal?

Generally,non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?

What is ammonia $(NH_3)$?

$(a)$ 'Sodium is a highly reactive metal and it cannot be obtained from its oxide by heating with carbon'. Give reason.
$(b)$ How can sodium be obtained from sodium chloride?

Give reasons for the following:
$(a)$ Generally,metals are not found in their free state.
$(b)$ Metals are good conductors of heat.

Which of the following is a reducing agent?