The method of concentrating the ore which makes use of the difference in density between ore and impurities is called

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.

Iron obtained from blast furance is:

Which of the following methods are not used to refine any metal?

$(A)$ Liquation   $(B)$ Calcination    $(C)$ Electrolysis    $(D)$ Leaching   $(E)$ Distillation

Choose the correct answer from the options given below.

Chromium is obtained by reducing concentrated chromite ore with