Cyanide Process or Cyanide Leaching Process of Extracting Gold and Silver

Mixing the tailings of gold and silver ores with a cyanide solution, or simply spraying the tailings with a cyanide solution, would cause a chemical reaction to take place. When gold and silver come in contact with cyanide, they it liquefy. Now the gold-silver-cyanide solution can be drained off and processed further.
Another chemical reaction is put to work to separate the cyanide solution from the liquid gold and silver. Zinc is mixed with this solution, which causes the gold and silver to return to a solid form.

Now there is a solid of gold, silver, and zinc. Yet another chemical reaction is used to remove the zinc. Sulphuric acid dissolves the zinc and leaves just the gold-silver mixture.

From this gold-silver solid, gold and silver are separated by further processing.

http://www.bodie.com/st/cyanide.asp

IIT JEE Chemistry Study Plan Chapter 16. Purification and Characterisation of Organic Compounds

Text Book Modern's abc of Chemistry CBSE Class XI

Sections in the chapter


16.1 Purification of Organic Compounds
16.2 Qualitative Analysis
16.3 Quantitative Analysis
16.4 Determination of Molecular Mass
16.5 Mass Spectrometer
16.6 Empirical Formula and Molecular Formula
16.7 Modern Methods of Structural Elucidation



Conceptual Questions with Answers: 14
Additional Numerical Problems for Practice: 10
Revision Exercises
Very Short Answer questions 20
Short Answer Questions 27
Long Answer Questions 10

Competition File
Numerical Problems
Objective Questions: 25
Fill in the blanks: 10
True or False: 5

Study Plan

Day 1

16.1 Purification of Organic Compounds

Day 2
Revision of 16.1
Practice Problems 16.1 to 16.11

Day 3

16.2 Qualitative Analysis
PP. 16. 12 to 16.15

Day 4

16.3 Quantitative Analysis

Day 5
16.3 contd.
PP. 16.13 to 16.18

Day 6
16.4 Determination of Molecular Mass

Day 7

16.5 Mass Spectrometer
16.6 Empirical Formula and Molecular Formula
Example 16.13 to 16.20


Day 8
Example 16.21 to 16.25
16.7 Modern Methods of Structural Elucidation
PP. 16.19 to 16.25

Day 9
PP. 16.26 to 16.32
Conceptual Questions with Answers: 14


Day 10
Additional Numerical Problems for Practice: 10
Revision Exercises: Very Short Answer questions 20

Day 11
Revision Exercises: Short Answer Questions 27

Day 12
Competition File: Objective Questions: 25

Day 13
Competition File: Fill in the blanks: 10
Competition File: True or False: 5

Day 14
Revision of concepts

Day 15
Revision of concepts

IIT JEE 2011 Study Plan for Chemistry

The two year study plan is posted in the following links

2009-10 XI portion
http://iit-jee-2011.blogspot.com/2009/04/iit-jee-2011-chemistry-annual-study_15.html

2010-11 XII portion

http://iit-jee-2011.blogspot.com/2009/04/iit-jee-2011-chemistry-annual-study.html