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a
In calcination, ore is heated with calcium.
b
Copper is found both in free as well as in combined state in nature.
c
Below1623 K, Al can reduce MgO to Mg, but above 1623 K, reverse is true.
d
Mond's process is used for purification of titanium.
answer is A.
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Detailed Solution
(1) calcination, is the heating of solids to a high temperature for the purpose of removing volatile substances.(3) Below 1623K, the ΔfGӨ of MgO is lower than that of Al2O3 and hence Mg can reduce Al2O3 to Al , but above 1623K,ΔfGӨ of Al2O3 is lower than that of MgO and hence Al can reduce MgO to Mg.(4) Mond's process is used for purification of Nickel.