Brass is an alloy of

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

With which of the following does the element carbon not give reaction?

What happens when copper oxide is heated in the presence of dihydrogen gas?

Give one most suitable word for the following statements.
$(a)$ Metal oxides which show basic as well as acidic behaviour.
$(b)$ Iodine,a non-metal is shining.

State whether the following statement is true or false:
At ordinary temperature,the surfaces of metals such as magnesium,aluminium,zinc,lead,etc.,are covered with a thin layer of oxide which prevents the metal from further oxidation.