Answer:
(a)
When reduced with carbon, reaction is non-spontaneous
since, Al has higher affinity for oxygen compared to than that of carbon.
Thus, (alumina)
cannot be reduced by
carbon. [1]
(b) Sometimes .depressants are used to prevent certain
types of particles from forming the froth with the bubbles. NaCN is used as a
depressants in the separation of ZnS and PbS.
NaCN acts as a depressant for ZnS but does not prevent PbS
from the formation of froth due to complex formation.
in
forth [1]
(c) (i) In lower part (higher temperature zone)
C is oxidised to CO.
(ii) In upper part (lower temperature zone) CO is a
better reducing agent.
[1]
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