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What type of mixtures can be separated by the given method?

Chromatography is used to separate mixtures of substances into their components.
Paper chromatography is used to separate two different liquids. For example ink, Ink is a mixture of several dyes. When ink is exposed to certain solvents, the colors dissolve and can be separated out. When we expose a piece of paper with ink on it to a solvent, the ink spreads across the paper when the ink dissolves.  Some inks are water-soluble, so you can use water as the solvent. Inks which are not water soluble are often alcohol-soluble for example rubbing alcohol as the solvent to create your chromatography.

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What are the principles (key scientific concepts) involved in the given method?
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In Chromatography a liquid is pumped through a bed of particles. The liquid is called the mobile phase and the particles the stationary phase. A mixture of the molecules that shall be separated is introduced into the mobile phase.

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Using an example of a suitable mixture, describe how can we separate the mixture by the given method

Step 1: Gather the Needed Materials (coffee Filter, Pencil, Beaker, Water Soluble Pen/marker, Water)

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Step 2: Cut a Strip of Filter Paper From the Coffee Filter and Using the Marker Draw a Thick Line Near the Bottom of the Filter Paper- About 1/4 Inch From the Bottom.

Once this is completed, carefully attach the strip to the pencil in order to suspend the strip over the water in the beaker. Make sure the ink does not touch the water-only the bottom of the filter paper should touch the water.

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Step 3: Allow the Water to Move Up the Paper for Approx. 5 Minutes and Then Remove the Strip From the Water

After about 5 minutes, hang the chromatogram on the side of the table to dry. This can then be taped to the attached worksheet if you choose to use it.

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Step 4: Students Should Identify the Individual Colors in the Chromatogram That Make Up the Markers Unique Mix of Ink.

Attached is a great worksheet that can prompt students as they move around the room comparing chromatograms.

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Step 5: Once Students Have Mastered the Technique Its Time to Put Their Skills to the Test in "The Case of the Celebrity Dog-napping"

Set-up for this culminating activity is relatively basic. You'll need 3 suspect water soluble pens of the same color but different brands.

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Step 6: Label the Pens As Different Suspects (you Can Have a Lot of Fun With This Using Teacher Photos and Profiles or Different Celebrity Nemesis). the Most Basic Would Be #1, 2, & 3

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Step 7: Write the Ransom Note on a Piece of Filter Paper in One of the Suspect Inks.

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4.What are the precautions,if any,to take note of the given method?

After putting papper in solvent,  Ensure top of solvent does not cover the mixture.
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Make sure the pencil line is not too near the bottom.

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When u draw the thin line make sure to use a pencil because it is not soluble, if a pen is used, the ink from the pen would be dissolved as it is soluble.

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what are the applications of chromatography
5 Uses of Chromatography in Everyday Life. ... Used to separate out a compound into its various components, chromatography plays a part in the realms of forensics, food regulation, athlete testing and even quality control in our favourite alcoholic drinks.