+91-8076753736[email protected]
logo
logo
-->

General Principles And Processes Of Isolation Of Elements

Question
CBSEENCH12011493
Wired Faculty App

In cyanide extraction process of silver from argentite ore, the oxidising and reducing agents are respectively.

  • O2 and CO2

  • O2 and Zn dust

  • HNO3 and Zn dust

  • HNO3 and CO

Solution

B.

O2 and Zn dust

The extraction of silver involves in cyanide process are:

(i) Ag2S + 2CN- + O2 →   2[Ag(CN)2]- + SO2(ii) [Ag(CN)2]- + Zn →    [Zn(CN)4]2- + Ag

Thus, in equation (i) O2 act as oxidising agent (Oxidise sulphide to SO2) and in (ii) Zn act as reducing agent (reduce Ag+ to Ag).

Some More Questions From General Principles And Processes of Isolation Of Elements Chapter

Is it true that under certain conditions. Mg can reduce Al2O3 and Al can reduce MgO? What are those conditions?

What is the role of depressant in froth floatation process?

Titanium is a metal of modern times. It is obtained as oxide. Why it could not be extracted earlier despite its wide occurence?

Name the common elements present in the anode mud in electrolytic refining of copper. Why are they so present?

What criterion is followed for the selection of the stationary phase in chromatography?

What is the role of cryolite in the metallurgy of aluminium?

Why is zinc not extracted from zinc oxide through reduction using CO?

What is the role of graphite rod in the electrometallurgy of aluminium?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation