CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements

Scroll down for PDF

CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers. 


1.Out of C and CO, which is a better reducing agent at 673 K? (2013)


1.Describe the role of

a) Iodine in the refining of titanium. (2010)

b) Collector in the froth floatation process. (2012)

2.Describe how the following changes are brought out:

a) Pig iron into steel

b) Zinc oxide into zinc metal. (2010)


1.Differentiate between

a) Calcination and roasting

b) Electrolytic reduction and electrolytic refining

c) Flux and slag

2.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.

3.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

4.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 metalobtained is in liquid state. Why?(2015)


1.Sam owns sites from where copper with other metals are mined. At sites he found the low grade copper ores are available with zinc and iron scraps.

a) Which of the two scraps should Sam use for the reduction of leached copper and why?

b) Mention the value in Sam’s choice.

c) What do you mean by blister copper?

d) Why is extraction of copper from copper pyrite more difficult than that from its oxide ore through reduction?

Please click the link below to download full pdf file for CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements.


Click on the text For more study material for Chemistry please click here - Chemistry

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

CBSE Board Exam Date Sheet of class 10th and 12th

The Central Board of Secondary Education (CBSE) released the Date sheet of Class 10 and Class 12th 2020 examination on the official website The board examination of Class 12 will be conducted from 15 February to 30 March 2020, while the board examination...

CBSE Counseling for Board exam 2020 starts today

The 23rd psychological Counseling starts 1st February (today) for The Class10 and Class12 CBSE students and their parents, by the Central Board of Secondary Education (CBSE).    This Counseling service is cost-free and this counseling service will be available every...

Simple tips to Excel in Examinations

We are entering the last quarter of the Academic Session. With examinations just around the corner, I am sure all of us are carrying a mixed bag of Stress, Excitement, and Anxieties!! So, first and foremost- Let’s be Positive and Futuristic! It’s most important to...

Studies Today