Home
Class 12
CHEMISTRY
Cinnabar (HgS) and galena (PbS) on roast...

Cinnabar `(HgS)` and galena `(PbS)` on roasting often give their respective metals, but zinc blende `(ZnS)` does not. Give reason.

Text Solution

Verified by Experts

On roasting sulphides are partly converted to their respective oxides. Since the oxides of lead and mercury are unstable, these bring about the reduction of their respective sulphides to the corresponding metals.
`PbS + 2PbO overset("Heat")to underset("unstable")(3Pb) + SO_2`
`HgS + 2HgO overset("Heat")to underset("unstable")(Hg) + SO_2`
However, zinc oxide is stable and it does not reduce ZnS to Zn.
Promotional Banner

Topper's Solved these Questions

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise COMPETION FILE (Objective Questions) (Multiple Choice Question with only one correct answer)|25 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise COMPETION FILE (Objective Questions) (Multiple Choice Question from competitive examinations)|49 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise Revision Exercises(Short answer questions)|42 Videos

  • ELECTROCHEMISTRY

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|20 Videos

  • HALOALKANES AND HALOARENES

    MODERN PUBLICATION|Exercise UNIT PRACTICE TEST|11 Videos

Similar Questions

Explore conceptually related problems

Cinnabar (HgS) and galena (PbS) on roasting give their respective metals but zinc blende does not. Explain.

Zinc blende on roasting often gives Zn metal.

Galena (PbS) on heating in limited supply of air gives lead metal. This is known as

Zinc blende ore on roasting at above 850^(@)C gives:

Give reason for the following: Aluminium is a reactive metal but does not corrode easily.

Give the uses of the following metals: Pb

Amongest the following, how many ores are roasted to convert them into their corresponding metal oxides, alumina, zinc blende, iron pyrites, copper pyrites, galena.