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

Correct answer: A. (A) is calcination and (B) is roasting (A) ZnCO _ 3 (S) Δ ⟶ ZnO(s) + CO _ 2 (g) Heating in absence of oxygen in calcination. (B) 2Zns(s) + 3 O _ 2 (g) → 2ZnO(g) + 2 SO _ 2 (g) heating in presence of oxygen in roasting Hence (A) is calcination while (B) in roasting.

JEE Main 202120 JulyEvening Shift

Exam: JEE Main
Year: 2021
Date: 20 July
Shift: Evening Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2021 · 20 July · Evening Shift · Chemistry · General Principles and Processes of Isolation of Metals

Consider two chemical reactions (A) and (B) that take place during...

Consider two chemical reactions (A) and (B) that
take place during metallurgical process:
(A)

{ZnCO}_{3\left(s\right)}\overset{\Delta}{⟶}{ZnO}_{\left(s\right)} + {CO}_{2\left(g\right)}

(B)

2{ZnS}_{\left(s\right)} + 3{O}_{2\left(g\right)}\overset{\Delta}{⟶}2{ZnO}_{\left(s\right)} + 2{SO}_{2\left(g\right)}

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) ${ZnCO}_{3}\left(S\right)\overset{\Delta}{⟶}ZnO\left(s\right) + {CO}_{2}\left(g\right)$

Heating in absence of oxygen in calcination.

(B) $2Zns\left(s\right) + 3{O}_{2}\left(g\right) \to 2ZnO\left(g\right) + 2{SO}_{2}\left(g\right)$

heating in presence of oxygen in roasting Hence (A) is calcination while (B) in roasting.

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