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Q.

Which of the following will be used to remove rust stains on cloth?

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a

Alcohol   

b

Oxalic acid solution   

c

Kerosene oil   

d

Lime 

answer is B.

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Detailed Solution

The primary uses for oxalic acid are cleaning and bleaching, particularly for rust removal (iron complexing agent). An example of a household cleaner with oxalic acid is Bar Keepers Friend. Due to its ability to combine with ferric iron to generate the stable water-soluble salt ferrioxalate ion, it is useful as a rust-removal agent.
 
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