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WBJEE: Study notes & Important Questions of Surface Chemistry

Jan 10, 2018 16:27 IST
    WBJEE 2018: Surface Chemistry
    WBJEE 2018: Surface Chemistry

    Study notes or Revision notes play an important role to crack any engineering entrance examination. With the help of these notes aspirants can easily cover all important concepts before appearing for the examination.

    Find the notes of chapter Surface Chemistry prepared by Subject Experts of Chemistry for coming WBJEE 2018. These notes are based on the latest syllabus of the examination.

    All important topics related to chapter Surface Chemistry are:

    • Adsorption,
    • absorption,
    • types of adsorption,
    • adsorption Isotherm,
    • Freundlich adsorption isotherm,
    • factors affecting adsorption of a gas by solid,
    • types of colloid with their dispersed phase and dispersion medium,
    • preparation of colloidal solution,
    • purification of colloidal solutions and
    • Properties of colloidal solutions

    Important Concepts:

    WBJEE Surface Chemistry Concepts

    WBJEE: Important Questions and Preparation Tips for Alcohol

    WBJEE Surface Chemistry Concepts

    WBJEE: Important Questions and Preparation Tips – Chemical Kinetics, (Part 1)

    Below are the important questions which have been asked in previous years’ examination:

    Question 1:

    The dispersed phase and dispersion medium of fog respectively are

    (a) Solid, liquid

    (b) Liquid, liquid

    (c) Liquid, gas

    (d) Gas, liquid

    Solution 1:

    The dispersed medium of fog is liquid and the dispersed phase is gas.

    Hence, the correct option is (c).

    WBJEE: Important Questions and Preparation Tips –Periodic Classification & Periodicity in Properties

    Question 2:

    Point out the false statement.

    (a) Colloidal sols are homogenous

    (b) Colloids carry +ve or –ve charges

    (c) Colloids show Tyndall effect

    (d) The size range of colloidal particles is 10-1000Å 

    Solution 2:

    Colloidal solution is heterogeneous in nature.

    It consists of two phases:

    (a) Dispersed phase

    (b) And dispersion medium.

    All the remaining options about colloidal solution are true.

    Hence, the correct option is (a).

    WBJEE: Important Questions and Preparation Tips – States of Matter

    You can also have a look on the following questions and solutions to check your preparation.

    Question 1:

    Rate of physical adsorption increases with:

    (a) Increase in temperature

    (b) Increase in pressure

    (c) Decrease in temperature

    (d) Decrease in pressure

    Solution 1:

    Physical adsorption being an exothermic process occurs more readily at lower temperature and decreases with increase in temperature.

    Hence, the correct option is (c).

    WBJEE: Important Questions and Preparation Tips – Electrochemistry

    Question 2:

    Alum helps in purifying water by:

    (a) Coagulating the mud particles

    (b) Making mud water soluble

    (c) Forming Si complex with clay particles

    (d) Sulphate part which combines with dirt and removes it

    Solution 2:

    Alum helps in aggregating the mud particles by neutralizing their charge, which then settles down as precipitates.

    Hence, the correct option is (a).

    Question 3:

    The coagulating power of electrolytes having ions Na+, Al3+ and Ba2+ for arsenic sulphide solution increases in the order   

    (a) Al3+ < Ba2+ < Na+

    (b) Na+ < Ba2+ < A13+

    (c) Ba2+ < Na2+ < Al3+

    (d) AI3+ < Na+ < Ba2+

    Solution 3:

    According to Hardy Schulze rule, greater the charge on oppositely charged ion, greater is its coagulating power. Since arsenic sulphide is a negatively charged sol. thus, the order of coagulating power is Na+ < Ba2+ < A13+

    Hence, the correct option is (b).

    WBJEE: Important Questions and Preparation Tips – Solutions

    Question 4:

    Chromatography is based on the principle of:

    (a) Chemical adsorption

    (b) Physical adsorption

    (c) Hydrogen bonding

    (d) Sedimentation

    Solution 4:

    Chromatography is based on the principle of Physical adsorption.

    Hence, the correct option is (b).

    WBJEE: Important Questions and Preparation Tips – Equilibrium

    Question 5:

    Emulsifying agent is a substance which:

    (a) Makes the emulsion homogeneous

    (b) Helps in coagulating the emulsion

    (c) Accelerates the dispersion

    (d) Stabilises the emulsion

    Solution 5:

    The substance which stabilises the emulsion is known as emulsifying agent.

    Hence, the correct option is (d)

    Conclusion:

    These notes will help WBJEE aspirants to save their valuable time and also get an idea about the question pattern. Do revise these notes and have a good command on the mentioned important topics.

    WBJEE 2018: Notification, Application, Dates, Eligibility, Exam Pattern, Syllabus

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