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Which of the following types of chromatography involves the process, where the mobile phase moves through the stationary phase by the influence of gravity or capillary action?

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Which of the following types of chromatography involves the process, where the mobile phase moves through the stationary phase by the influence of gravity or capillary action?

(a) Column Chromatography

(b) High Pressure Liquid Chromatography

(c) Gas Chromatography

(d) Planar Chromatography

This question was posed to me during an online exam.

Question is from Introduction to Chromatography in section Chromatography of Analytical Instrumentation

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The correct choice is (d) Planar Chromatography

The best I can explain: In Planar Chromatography, the stationary phase is supported on a flat plate of paper. The mobile phase moves by the influence of gravity or capillary action.

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