KS3 chromatography 2021

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

Dyes in water soluble markers may be separated by means of..

• crystallization
• sublimation
• chromatography
• sedimentation

In chromatography, if a solute does not separate and remains on the start line ....

• the solute is insoluble in the solvent
• the solute is soluble in the solvent
• the solvent is insoluble in the solute
• the solvent is soluble in the solute

In paper chromatography, the LEAST soluble solute .......

• does not move from the start point
• stays closest to the start point
• travels furthest away from the start point
• can be found in the middle of the chromatogram

In paper chromatography, the MOST soluble solute .......

• does not move from the start point
• stays closest to the start point
• travels furthest away from the start point
• can be found in the middle of the chromatogram

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