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Uses of Nitric Acid

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Question

An ore sample of galena (PbS) is contaminated with zinc blende (ZnS). Name one chemical which can be used to
concentrate galena selectively by froth floatation method.

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Solution

The galena is concentrated by using a collector, potassium ethyl xanthate and sodium cyanamide and alkali as depressant.
The mixture, depresses the activity of ZnS.

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Q. An ore sample of galena

(P b S)

is contaminated with zinc blende

(Z n S)

. Name one chemical which can be used to concentrate galena selectively by froth floatation method.

Q. Which of the following ores can be concentrated by froth floatation method and why?

F e_{2} O_{3}, Z n S, A I_{2} O_{3}

Q. Complexes formed in the following methods are:

(I) Mond's process for purification of nickel
(II)Removal of lead poisoning from the body
(III) Cyanide process for extraction of silver
(IV) Froth floatation process for separation of

Z n S

from galena are by using depressant

Q. Complexes formed in the following methods are–
(I) Mond's process for purification of nickel
(II) Removal of unreacted AgBr from photographic plate
(III) Removal of lead poisoning from the body
(IV) Cyanide process for extraction of silver
(V) Froth floatation process for separation of ZnS from galena ore by using depressant.

For which ore of the metal, froth floatation method is used for concentration?

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Uses of Nitric Acid

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