a) Water is the mobile phase, ink is the stationary phase.
b) Ink is the mobile phase, paper strip is the stationary phase.
c) Paper strip is the stationary phase, ink is the mobile phase.
d) Water is the mobile phase, paper strip is the stationary phase.
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The mobile phase is a solution that travels up the stationary phase, due to capillary action. The mobile phase is generally mixture of non-polar organic solvent, while the stationary phase is polar inorganic solvent water. Here paper is used to support the stationary phase, water.
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