CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set B

Read and download free pdf of CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set B. Download printable Chemistry Class 12 Worksheets in pdf format, CBSE Class 12 Chemistry Unit 6 General Principles and Processes of Isolation of Elements Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Chemistry Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern

Unit 6 General Principles and Processes of Isolation of Elements Chemistry Worksheet for Class 12

Class 12 Chemistry students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Chemistry will be very useful for tests and exams and help you to score better marks

Class 12 Chemistry Unit 6 General Principles and Processes of Isolation of Elements Worksheet Pdf

General Principles and Processes of Isolation of Elements
 
1. Out of C and CO, which is a better reducing agent at 673 K?
 
2. How is copper extracted with a low grade ore of it?
 
3. What is the role of zinc in extraction of Silver?
 
4. Describe the role of SiO2 in extraction of copper from copper matte and write the equation involved.
 
5. What is “copper matte”?
 
6. What are froth stabilizers? Give two examples
 
7. The graphite electrodes in the extraction of ‘aluminium’ by Hall-Heroult process need to be changed frequently. Why?
 
8. Describe how the following changes are brought out:
a) Pig iron into steel.
b) Zinc oxide into zinc metal.
 
9. Write the chemical reactions involved in the process of extraction of Gold. Explain the role of dilute NaCN and Zn in this process.
 
10. Differentiate between
a) Calcination and roasting
b) Electrolytic reduction and electrolytic refining
c) Flux and slag
 
11. Write the chemical reactions which take place in the following operations:
a) Electrolytic reduction of Al2O3.
b) Isolation of Zn from zinc blende.
c) Mond’s process for refining of Ni.
d) I2 in van Arkel process of refining
e) Cryolite in extraction of Aluminium
f) Dilute NaCN in extraction of silver
g) Collector in the froth floatation process
 
12. Describe the principle involved in:
a) Electrolytic refining of metals.
b) Zone refining of metals
c) Froth floatation process
d) Chromatography
e) Vapour phase refining
 
13. Give reasons:
a) Copper matte is put in silica lined convertor.
b) Cryolite is added to alumina during electrolytic reduction.
c) Pine oil is used in the froth floatation process
 
14. a) Name the method used for the refining of titanium.
b) What is the role of Zn in the extraction of silver?
c) Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?
 
15. Write down the reactions taking place in different zones of a blast furnace during extraction of iron. How is pig iron different from cast iron?
 
16. a) Name the impurities deposit as anode mud during electrolytic refining of copper.
b) What type of metal can be refined by liquation method.
c) Name the method for refining of metals which are used as semiconductors.
 
17. Copper can be extracted by hydrometallurgy but not zinc. Explain?
 
18. What is German silver? Write its use.
 
19. Explain the following:-
a) Zinc but not copper is used for recovery of Ag from the complex[Ag(CN)2].
b) Partial roasting of sulphide ore is done in the metallurgy of copper.
c) Extraction of Cu from pyrites is difficult than that from its oxide ore through reduction.
 
20. Describe the principles of extraction of Zinc from zinc blende.


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Unit 6 General Principles and Processes of Isolation of Elements CBSE Class 12 Chemistry Worksheet

The above practice worksheet for Unit 6 General Principles and Processes of Isolation of Elements has been designed as per the current syllabus for Class 12 Chemistry released by CBSE. Students studying in Class 12 can easily download in Pdf format and practice the questions and answers given in the above practice worksheet for Class 12 Chemistry on a daily basis. All the latest practice worksheets with solutions have been developed for Chemistry by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their examinations. Studiestoday is the best portal for Printable Worksheets for Class 12 Chemistry students to get all the latest study material free of cost. Teachers of studiestoday have referred to the NCERT book for Class 12 Chemistry to develop the Chemistry Class 12 worksheet. After solving the questions given in the practice sheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 12 Chemistry designed by our teachers. After solving these you should also refer to Class 12 Chemistry MCQ Test for the same chapter. We have also provided a lot of other Worksheets for Class 12 Chemistry which you can use to further make yourself better in Chemistry.

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