State the principle involved of chromatography?
Important Questions on Function
At a refinery, petroleum is separated into several components by a process called fractional distillation using a fractionating column. Which of the following statement is incorrect about the process?
(I) Temperature decreases from the bottom to the top of the column
(II) At each level in the column only one compound is collected
(III) The fraction collecting at the top of the column is less volatile
(IV) The fraction with the highest boiling point condenses first and gets collected near the base of the fractionating column.
Dyes from black ink (Paper Chromatography / Centrifugation)
What separation techniques will you apply for the separation of different pigments from an extract of flower petals?
(Centrifugation/ Chromatography)
Give an example for the mixture having the following characteristics. Suggest a suitable method to separate the components of these mixtures.
Two or more coloured constituents soluble in some solvent.
Name the method of separating the components of the following mixture:
Solid dye from fountain pen ink(chromatography/boiling)
A child wanted to separate the mixture of dyes constituting a sample of ink. He marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in figure. The filter paper was removed when the water moved near the top of the filter paper.
(a) What would you expect to see, if the ink contains three different coloured components?
(b) Name the technique used by the child.
(c) Suggest one more application of this technique.
