Q5 of 26 Page 1

What is the reason for the stability of colloidal sols?

The stability of the colloid is due to these harges only. Due to the presence of these similar and equal charges, the particles of the colloidal sol repel one another and cannot combine together to form larger particles which keeps them dispered in the medium and the colloidal remains stable. Another reason for stability of the colloidal sol is the brownian movement of the sols.


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What type of magnetism is shown by a substance if its domains are arranged in equal number and in opposite directions?

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Write the IUPAC name of the given compound :


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For the given cells :

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


Answer the following :


A. Which cell is used in hearing aids?


B. Which cell was used in the Apollo space programme?


C. Which cell is used in automobiles and inverters?


D. Which cell does not have a long life?


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When pyrolusite ore is fused with KOH in the presence of air, a green coloured compound (A) is obtained which undergoes disproportionation reaction in acidic medium to give a purple coloured compound (B):

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


B. What happens when compound (B) is heated?