Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

  • Option 1)

    CO_{2} is more volatile than  CS_{2}

  • Option 2)

    Metal sulphides are thermodynamically more stable than CS_{2}

  • Option 3)

    CO_{2} is thermodynamically more stable than  CS_{2}

  • Option 4)

    Metal sulphides are less stable than the corresponding oxides

 

Answers (1)

As we learnt in

Roasting -

It is heating of the ore in presence of air below its fusion temperature.

- wherein

2PbS +3O3 \rightarrow 2PbO + 2SO2

 

The reduction of metal sulphides by carbon reduction has positive  \Delta G whereas, \Delta G is negative for the same process with metal oxides. So, metal sulphides are more stable than oxides. 

 


Option 1)

CO_{2} is more volatile than  CS_{2}

This option is incorrect.

Option 2)

Metal sulphides are thermodynamically more stable than CS_{2}

This option is incorrect.

Option 3)

CO_{2} is thermodynamically more stable than  CS_{2}

This option is incorrect.

Option 4)

Metal sulphides are less stable than the corresponding oxides

This option is correct.

Preparation Products

Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 22999/- ₹ 14999/-
Buy Now
Knockout JEE Main April 2022

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 34999/- ₹ 24999/-
Buy Now
Test Series JEE Main April 2021

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 6999/- ₹ 4999/-
Buy Now
JEE Main Rank Booster 2021

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 13999/- ₹ 9999/-
Buy Now
Test Series JEE Main April 2022

Take chapter-wise, subject-wise and Complete syllabus mock tests and get an in-depth analysis of your test..

₹ 6999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions