Q5 of 40 Page 1

Write the main reason for the stability of colloidal sols.

The main reasons for the stability of colloidal sols are:

a) The presence of a sheath of liquid in which colloidal particles are extensively solvated provides stability.


b) The coagulation of the colloidal sol is prevented by the presence of equal and similar charges on the colloidal particles.


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What type of magnetism is shown by a substance if magnetic moments of domains are arranged in same direction?

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Write the IUPAC name of the given compound:

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From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell


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A. Which cell is used in hearing aids?


B. Which cell was used in Apollo Space Programmed?


C. Which cell is used in automobiles and inverters?


D. Which cell does not have long life?

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When chromite ore is fused with NaOH in presence of air, a yellow coloured compound (A) is obtained which on acidification with dilute sulphuric acid gives a compound (B). Compound (B) on reaction with KCl forms a orange coloured crystalline compound (C).

A. Write the formulae of the compounds (A), (B) and (C)


B. Write one use of compound (C).