chromatography

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation

On the chromatogram given -------------- is mixture.

• red
• orange
• green
• black

A pure substance shows ------------------ spot on chromatogram

• 0

• 1

• 2

• 3

What is chromatography?

• A way to see pretty colors

• A laboratory technique used to separate a mixture.

• A form of distillation

Two or more substances that are mixed together but not chemically combined create a...

• solvent

• compound

• mixture

Which of the following mixture/s is/are separated by chromatography?

• Pigments from natural colours

• Colours in a dye

• Colours of flowers extracts

• All the above

Which of the dyes was a pure substance?

• Dyes 1 and 6

• Dye 4

• Dye 5

• Dyes 2 and 3

Which two were the same mixture of dyes?

• dyes 2 and 5

• dyes 1 and 5

• dyes 3 and 4

• dyes 2 and 6

When the chromatography paper is placed in water the water level should initially be ____ the starting pencil line.

• above

• below

• exactly on

• above the ink dot

A pencil line is drawn at the v

bottom of the chromatography paper because ...

• the pencil particles do not dissolve in water

• the pencil particles dissolves in water

• the pencil particles undergo chromatography and split up

• it stops the ink from moving downwards into the water