Chromatography

The physical separation of mixtures into individual components is..

• chromatography
• opacity 
• latent
• trace evidence 

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

• distillation

• filtration

• chromatography

• sedimentation

chromatography separates the mixture of dyes on the basis of their ----------------------------

• density
• solubility
• gravity
• boiling point

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

• red
• orange
• green
• black

Tags

NGSS.MS-PS1-2

A pure substance shows ------------------ spot on chromat gram

• 0
• 1
• 2
• 3

The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?

• P only
• S only
• P and S
• P and X

Tags

NGSS.MS-PS1-2

The diagram shows the chromatogram for three colouring dyes and that for a brown marker. What dye(s) are contained in the marker's ink?

• purple and green
• purple and yellow
• purple only
• green and yellow

Tags

NGSS.MS-PS1-2

The R_f value  for the blue component is 

• 0.3
• 0.7
• 10
• 3

Why must the base line be drawn in pencil and not pen?

• a) Pencil is good at keeping substances in place.
• b) Pencil is soluble in water
• c) Pencil is insoluble in water
• d) Pencil is not coloured

Tags

NGSS.HS-PS2-6

 If a substance is not attracted to the water what happens to the 'dot'?

• a) Dot moves to the top of the paper
• b) Dot does not move at all
• c) Dot moves to the left or right
• d) Dot moves down to the bottom of the paper