Home
Class 12
CHEMISTRY
Roasting of ores is done in...

Roasting of ores is done in

A

to burn off sulphur, arsenic , antimony etc. as oxides and convert all the iron and copper to their oxides

B

to burn off arsenic, antimony etc. as oxides and burn off sulphur so that enough of it remains to combine with all the copper.

C

to burn off sulphur partially, in order to leave enough of sulphur to combine with arsenic, antimony etc. and to convert all the rion ad copper to oxides.

D

to melt arsenic and antimony sulphides etc. and remove them by liquation and to burn off sulpur partially to leave enough to combine with copper and iron.

Text Solution

Verified by Experts

The correct Answer is:
C
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    NCERT FINGERTIPS ENGLISH|Exercise NCERT EXEMPLAR PROBLEMS|13 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    NCERT FINGERTIPS ENGLISH|Exercise ASSERTION & REASON|15 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

  • ELECTROCHEMISTRY

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

  • HALOALKANES AND HALOARENES

    NCERT FINGERTIPS ENGLISH|Exercise NCERT Exemplar|27 Videos

Similar Questions

Explore conceptually related problems

Leaching of an ore is done by

Roasting of sulphide ore is generally performed in

Knowledge Check

  • Why partial roasting of sulphide ore is done in the metallurgy of copper ?

    A
    1.Auto-reduction of `Cu_(2)O` formed is carried out by remaining `Cu_(2)S` in the reaction.
    B
    2.Cu is separated out by partial reduction due to sedimentation
    C
    3.Due to difference in gravity `Cu_(2)O` and `Cu_(2)S` are separated.
    D
    4.Complete roasting cannot be done in one step hence partial roasting is done.

    • Similar Questions

    Explore conceptually related problems

    Explain the following (a) Although Au is soluble in aqua-regia, Ag is not (b) Zinc and hot copper is used for recovery of Ag from the complex [Ag(CN)_(2)]^(-) (c) Aluminium metal is frequently used as a reducing agent for extraction of metal such as chromium manganese etc. (d) Partial roasting of sulphide ore is done in the metallurgy of copper.

    Roasting of copper pyrites is done:

    Both calcination and roasting are done in ............... furnace.

    The gas obtained by roasting of sulphide ore is reacted with acidified potassium dichromate. A green colored compound 'X' is formed. The compound X can be :

    Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. In self reduction process, the species which bring about the reduction is :

    Main ore of lead is gaalena.This is mined and separated from other minerals by froth flotation.There are two methods of extracting the lead. (i)First method involves the roasting of ore followed by reduction with coke or CO. (ii)Second method involves the partial roasting of ore followed by self reduction. Which of the following statement is incorrect about the extraction of lead from galena ?

    Assertion : Desilverisation of lead is done by Parke's method DeltaG . Reason : When lead-silver alloy is poor in silver, zinc is added to molten ore.

    Home
    Profile