The chemical process of manufacturing of steel from its ore haematite involves

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(i)$ Every mineral is an ore but every ore is not a mineral.
$(ii)$ Slag is a product formed during the extraction of metal by the combination of flux and impurities.
$(iii)$ Highly pure metals can be obtained by zone refining.
$(iv)$ Carnallite is an ore of magnesium and sodium.

Which of the following is correctly matched?

Match List-$I$ (Substances) with List-$II$ (Processes) used for their production.

List-$I$ (Substances)	List-$II$ (Processes)
$(a)$ Sulphuric acid	$(i)$ Haber process
$(b)$ Steel	$(ii)$ Bessemer process
$(c)$ Sodium hydroxide	$(iii)$ Leblanc process
$(d)$ Ammonia	$(iv)$ Contact process

Choose the correct option for $a-b-c-d$.

Refractory materials are generally used in furnaces because

Bronze is a mixture of . . . . . . metals.