Q17 of 55 Page 44

Among sulphurous acid and sulphuric acid, which is stronger and why?

Sulphuric acid (H2SO4) is much stronger than sulphurous acid (H2SO3) because when sulphuric acid dissociates, it gives more number of H+ ions i.e. 2 whereas on dissociation, sulphurous acid gives less number of H+ ions i.e. 1.


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15

What happens when an acid or a base is added to the water? Why does the beaker appear warm? Why should we always add acid or base to the water and not water to the acid or base?

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Give reasons:

(i) Use of a mild base like baking soda provides relief on the area stung by honeybee.


(ii) Baking powder is added to make the cakes spongy and soft.


(iii) The colour of blue copper sulphate crystals changes to white on heating.

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Acetic acid is a weak acid and ammonia is a weak base. Discuss the term weak.

 19

Give reason why solution of sulphuric acid conduct electricity whereas, alcohol does not.