Which one of the following techniques is not used to spot components of a mixture separated on t...

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Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
(a) \( \mathrm{I}_{2} \) (Solid)
(b) U.V. Light
(c) Visualisation agent as a component of mobile phase.
(d) Spraying of an appropriate reagent.
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