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JEE Main 202315 AprilMorning Shift
Exam
JEE Main
Year
2023
Date
15 April
Shift
Morning Shift
Subject
Chemistry
Chapter
General Principles and Processes of Isolation of Metals

JEE Main 2023 · 15 April · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

Which one of the following is not an example of calcination?

Which one of the following is not an example of calcination?

Options

  1. ACaCO3→∆CaO+CO2{CaCO}_{3}\overset{∆}{\to}CaO + {CO}_{2}
  2. BFe2O3.xH2O→∆Fe2O3+xH2O{Fe}_{2}{O}_{3} . {xH}_{2}O\overset{∆}{\to}{Fe}_{2}{O}_{3} + {xH}_{2}O
  3. C2PbS+3O2→∆2PbO+2SO22PbS + 3{O}_{2}\overset{∆}{\to}2PbO + 2{SO}_{2}
  4. DCaCO3.MgCO3→∆CaO+MgO+2CO2{CaCO}_{3} . {MgCO}_{3}\overset{∆}{\to}CaO + MgO + 2{CO}_{2}

Correct answer

C. 2PbS+3O2→∆2PbO+2SO22PbS + 3{O}_{2}\overset{∆}{\to}2PbO + 2{SO}_{2}

Step-by-step solution

Calcination is a process in which ore is heated in the absence of air or air might be supplied in a limited quantity.

Roasting involves the heating of ore lower than its melting point in the presence of air or oxygen.

2PbS+3O2→∆2PbO+2SO22PbS + 3{O}_{2}\overset{∆}{\to}2PbO + 2{SO}_{2}

The above reaction is an example of roasting. Rest all the reactions are heated in the absence of oxygen.

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