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Complete CBSE Class 12 Chemistry Exam Package for the last Moment

Mar 6, 2013 12:31 IST

    Complete CBSE Class 12 Chemistry Exam Package for the last Moment, given here

    Q. what is meant by 'doping' in a semiconductor?

    Answer.     
    Doping: - It is adding appropriate amount of suitable impurities in the semiconductor

    Q. what is the role of graphite in the electrometallurgy of aluminium?

    Answer.
    Graphite is used as both anode as well as cathode. It prevents the formation of oxygen gas.

    Q. What are the following substances? Give one example of each one of them.
    (1) Tranquilizers
    (ii) Food preservatives
    (iii) Synthetic detergents

    Answer.
    a.Tranquilizers: - These are a class of compounds which are used for the treatment of stress, mild or even severe mental diseases. For example- veronal, etc.

    b.Food preservatives: - They prevent spoilage of food due to microbial growth. For example- sodium benzoate.

    c.Synthetic detergents: - these are cleansing agents which have all the properties of soaps but do not contain any soap. For example- Sodium laurylsuiphate.


    Click on the links given below

    CBSE Class 12 important questions for chemistry

    Guess paper for CBSE Class 12 Chemistry 2013 Set-2


    Guess paper for CBSE Class 12 Chemistry 2013 Set-1

    Practice Paper for CBSE Class 12 Chemistry 2013 Set 2

    Practice Paper for CBSE Class 12 Chemistry 2013 Set 1

    CBSE Class 12th Chemistry Set I solved Question Paper 2012


    CBSE Class 12th Chemistry Set II solved Question Paper 2012

    CBSE Class 12th Chemistry Set III solved Question Paper 2012

    CBSE Class 12 Chemistry Syllabus 2012-13

    CBSE Class 12 Chemistry Sample Paper 2013

    CBSE Class 12 Chemistry 2008 Question Paper

    CBSE Class 12 Chemistry Theory Set I Question Paper- 2011

    CBSE Class 12 Chemistry Theory Set III Question Paper- 2011

    CBSE Class 12 Chemistry Theory Set II Question Paper- 2011

    CBSE Class 12 Chemistry Sample Question Paper 2010

    CBSE Class 12 Chemistry set 2 Sample Question Paper 2010

    To the CBSE Results click on the link given below

    CBSE Results

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