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     EduGorilla 
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    A man went door to door posing as a goldsmith and promising to bring glitter and shine to old, dull gold ornaments. Mrs. X gave him her gold bangles, which he dipped in a particular solution. The bangles sparkled like new. But later on, she observed that the weight of the bangles were drastically reduced and was cheated.

    Which solution must he have used?

    Options :-

    1. Nitric acid
    2. Aqua regia
    3. Alum
    4. Vitriol
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