Which of the following statements is correct?

The process of the extraction of copper from copper pyrites involves:-
$(I)$ Froth floatation $(II)$ Calcination $(III)$ Roasting $(IV)$ Self reduction $(V)$ Smelting $(VI)$ Liquation $(VII)$ Electrorefining

Which of the following reactions is $NOT$ entropy-driven with reference to extractive metallurgy? (unbalanced reactions)

Bell metal is an alloy of which of the following?

Which of the following metals is present in Brass,Bronze,and German silver?

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.
$(i)$ $Cu$ metal is extracted from its sulphide ore by reduction of $Cu_2O$ with $FeS$.
$(ii)$ An ore of Tin containing $FeCrO_4$ is concentrated by magnetic separation method.
$(iii)$ Auto reduction process is used in the extraction of $Cu$ & $Hg$.
$(iv)$ Cassiterite and Rutile are oxide ores of the metals.