The pair that does not require calcinati...

The pair that does not require calcination is

A

`ZnCO_3 overset(Delta)(rarr)ZnO + CO_2`

B

`Fe_2O_3.XH_2O overset(Delta)(rarr)Fe_2O_3 + XH_2O`

C

`CaCO_3.MgCO_3 overset(Delta)(rarr) CaO + MgO + 2CO_2`

D

`2Cu_2S + 3O_2 overset(Delta)(rarr)2Cu_2O + 2SO_2`

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The correct Answer is:

D

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