Currency notes can be marked with an invisible ink. Thieves can be trapped because this ink

Shows up in ultraviolet light

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Turns red on adding alkali

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Turns blue on adding acid

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It attracted by a magnet

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Solution

The correct option is A Shows up in ultraviolet light
Invisible ink shows up in ultraviolet light.
Modern UV-invisible ink is mainly made by a fluorescent derived from things in nature that glow when exposed to an UV light.

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Similar questions

(a) Name one indicator which turns red on adding an acid.

(b) Name one indicator which turns red on adding a base.

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