JEE Main202120 Jul 2021Evening ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual
Consider two chemical reactions (A) and (B) that take place during metallurgical process: (A) ZnCO 3 s ⟶ Δ ZnO s + CO 2 g (B) 2 ZnS s + 3 O 2 g ⟶ Δ 2 ZnO s + 2 SO 2 g The correct option of names given to them respectively is:
Options
- A(A) is calcination and (B) is roasting
- BBoth (A) and (B) are producing same product so both are roasting
- CBoth (A) and (B) are producing same product so both are calcination
- D(A) is roasting and (B) is calcination
Correct answer
A. (A) is calcination and (B) is roasting
Step-by-step solution
(A) ZnCO 3 S ⟶ Δ ZnO s + CO 2 g Heating in absence of oxygen in calcination. (B) 2 Zns s + 3 O 2 g → 2 ZnO g + 2 SO 2 g heating in presence of oxygen in roasting Hence (A) is calcination while (B) in roasting.