Home › MCQs › EEJ MAIN Chemistry › Question #7121
Back to Questions
EEJ MAIN Chemistry QUESTION #7121
Question 1
Among the chemical reactions listed below, which one does NOT represent a calcination process?
  • $Fe_{2}O_{3}\cdot xH_{2}O \xrightarrow{\Delta} Fe_{2}O_{3} + xH_{2}O$
  • $2Cu_{2}S + 3O_{2} \rightarrow 2Cu_{2}O + 2SO_{2}$✔️
  • $ZnCO_{3} \xrightarrow{\Delta} ZnO + CO_{2}$
  • $CaCO_{3}\cdot MgCO_{3} \xrightarrow{\Delta} CaO + MgO + 2CO_{2}$
Correct Answer Explanation
Calcination involves heating the ore in the absence or limited supply of air, typically to decompose carbonates or hydrated oxides. Equation B describes the heating of a sulphide ore in the presence of excess oxygen to produce an oxide and $SO_2$, which is defined as **Roasting**, not calcination.