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Q.

Is it true that nitric acid helps to remove stains on woodwork?


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a

True

b

False  

answer is B.

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Detailed Solution

The above statement is false.
Proteins and nitric acid react to create yellow compounds. Nitric acid should not be used to remove stains from carpets and furniture made of wood. Goldsmiths use it regularly to clean jewellery made of gold and silver and decorations. It is also used in the production of fertilizers like ammonium nitrate.
The corrected statement would be, "Nitric acid helps to remove stains on gold and silver jewellery".
 
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Is it true that nitric acid helps to remove stains on woodwork?