Verified Solution • 2025–26 Session moderate

QJEEM19Ch9a12: JEE Main 2019 Chemistry - Class 11 JEEM19Ch9a12 Solution: The reaction that does NOT define calcination is :

The reaction that does NOT define calcination is :

Multiple Choice Options

  • A 2Cu2S + 3O2 ⟶Δ 2Cu2O + 2SO2
  • B CaCO3 . MgCO3 ⟶Δ CaO + MgO + 2CO2
  • C ZnCO3 ⟶Δ ZnO + CO2
  • D Fe2O3 . XH2O ⟶Δ Fe2O3 + XH2O

Step-by-Step Verified Solution

Calcination involves heating of the ore in absence of air.

2Cu2S + 3O2 ⟶Δ 2Cu2O + 2SO2 ↑\uparrow

This reaction involve roasting. Roasting is carried out mainly for sulphide ores in presence of excess of oxygen.

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