The pair that does NOT require calcination is :
Calcination -
It involves heating of the ore below its fusion temperature in absence of air.
- wherein
Fe2O3 xH2O Fe2O3 + xH2O
ZnCO3 ZnO + CO2
As we have learned in oxides
both are in oxide form therefore 110 change on calcinatiom
Option 2)Option 3)Option 4)
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