The pair that does NOT require calcination is : [JEE Main - 2019(Ja...

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The pair that does NOT require calcination is :
[JEE Main - 2019(January)]
\( \mathrm{P} \)
(1) \( \mathrm{ZnO} \) and \( \mathrm{MgO} \)
(2) \( \mathrm{ZnO} \) and \( \mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O} \)
W
(3) \( \mathrm{ZnCO}_{3} \) and \( \mathrm{CaO} \)
(4) \( \mathrm{Fe}_{2} \mathrm{O}_{3} \) and \( \mathrm{CaCO}_{3} . \mathrm{MgCO}_{3} \)
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