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Q.

An iron nail is kept in each of the following liquids. In which of the following would it lose its shine and appear dull?


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a

Kerosene. 

b

Mustard oil.

c

Soft drink.

d

Coconut Oil.

answer is B.

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Detailed Solution

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An iron nail would lose its shine and appear dull in the soft drink.
This is because soft drinks contain carbonic acid, which reacts with iron nails, an iron nail kept in a soft drink will lose its shine and appear dull. An iron nail stored in a soft drink will lose its lustre and become dull. Because mustard oil, coconut oil, and kerosene do not react with iron nails, they retain their lustre when stored in these solutions.
 
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