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  1. Which one of the following organic compound is used to remove stains of iron compounds?

    2. A.

     Oxalic acid
    B.

     Benzoic acid
    C.

     Phthalic acid
    D.

     Cinnamic acid

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    Answer : Option A

    Explanation :

    Oxalic acid is widely used as an acid rinse in laundries, where it is effective in removing rust and ink stains because it converts most insoluble iron compounds into a soluble complex ion.

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