Q.

The excess addition of which of the following given substances will reverse the effect of a base?


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a

Lime

b

Ammonium hydroxide solution

c

Hydrochloric acid 

d

Baking powder 

answer is D.

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Detailed Solution

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The excess addition of  Hydrochloric acid will reverse the effect of a base
The reaction between an acid and a base is defined as a neutralisation reaction because, during the reaction, both substances neutralise each other. So when acid is added to the base, it will neutralise the base. But we have taken the acid in excess so that it will reverse the effect of the base.
 
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