Statement I: Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III)
Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer form the options given below.
Statement I: Leaching of gold with cyanide ion in absence of air / O2 leads to cyano complex of Au(III)
Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer form the options given below.
Option 1 -
Both Statement I and Statement II are correct.
Option 2 -
Both Statement I and Statement II are incorrect.
Option 3 -
Statement I is correct but Statement II is incorrect.
Option 4 -
Statement I is incorrect but Statement II is correct.
-
1 Answer
-
Correct Option - 4
Detailed Solution:Leaching involves the given reaction,
Here, O2 is required for formation of Au (l) cyanide complex but no complex in absence of O2.
In above displacement reaction, Zn is oxidized.
Similar Questions for you
is the temperature Co-efficient of cell. The cell having less variation of EMF, with respect to temperature have high efficiency.
Below 1350° C, Mg can reduce Al2O3 and above 1350°C, Al can reduce MgO (from Ellingham diagram).
Melting and boiling point of Mg are lower than that of Al.
In ores/mineral available earthy and undesired impurities are gangue
Sol. Reactivity towards depend on stability of carbocation formed
Higher the E.N. difference between hydrogen and other atom then higher be the strength of intermolecular H-bond
Here, order of difference in E.N is
O - H > N – H > C - H
Hence, correct order of H bond strength is,
CH4 < HCN < NH3
Taking an Exam? Selecting a College?
Get authentic answers from experts, students and alumni that you won't find anywhere else
Sign Up on ShikshaOn Shiksha, get access to
- 65k Colleges
- 1.2k Exams
- 687k Reviews
- 1800k Answers