What is the formula of Ink used in elections ?
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AgNO3
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CuSO4
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FeSO3
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CaCl
Reveal answer
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A
Correct answer
Explanation
Silver nitrate (AgNO3) is used in indelible election ink because it reacts with the keratin in skin and fingernails to form silver argentate, which cannot be washed off and remains visible for several days. The purple stain is difficult to remove and prevents duplicate voting.
AI explanation
The indelible ink used to mark voters' fingers during elections contains silver nitrate (AgNO3), which reacts with skin and light to leave a stain that resists washing off for days or weeks. Copper sulfate, ferrous sulfate, and calcium chloride don't have this photosensitive, skin-staining property and aren't used for this purpose.