UNIT-I Choose the correct answer . b) Al O nH O . c) SO . c) MgCO MgO + CO .
b) Al O . a) Al . d) Carbon and hydrogen are suitable reducing agents for metal sulphides. .
c) A-iv , B-ii , C-iii , D-i . d)Electromagnetic separation . b) Cu(s) + Zn (aq) Zn(s) + Cu (aq) + + . c) Sodium .
b) Infusible impurities to soluble impurities . c) Galena . a) Lower the melting point of alumina . a) Carbon reduction .
c) Displacement with zinc . c) Mg . b) Van Arkel process . d) Both (a) and (c) .
d) In the metallurgy of gold, the metal is leached with dilute sodium chloride solution . b) Impure copper . b) Δ G Vs T . c) ∆ ∆ G T is negative .
b) Al O + 2Cr Cr O + 2Al . b) The graph for the formation of CO is a straight line almost parallel to free energy axis.