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JEE Main2019Chemistry
Q.

The pair that does NOT require calcination is 

  1. A

    Fe2 O3 and CaCO3MgCO3

  2. B

    ZnCO3 and CaO 

  3. C

    ZnO and MgO 

  4. D

    ZnO and Fe2 O3 xH2 O 

Solution

ZnO and MgO

They are oxides while other are carbonates or hydrated oxides which require calcination.

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