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प्रश्न
The dyes present in fountain pen ink can be separated by the technique of :
पर्याय
fractional distillation
infrared photography
crystallisation
chromatography
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उत्तर
chromatography
Chromatography is the technique used to separate the contents of a mixture, where solute particles are in extremely small quantity.
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संबंधित प्रश्न
Give one difference between atoms and molecules.
What are the two conditions for the interconversion of states of matter ?
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
Describe in your own words, what happens to the particles when salt dissolves in water.
An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.
Name one solid, one liquid and one gaseous non-metal.
How would you confirm that a colourless liquid given to your is pure water ?
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Explain what happens when a beam of light is passed through a colloidal solution.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
What is the difference between colloids and suspensions ?
Name the process by which all the dye can be recovered from black ink.
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Explain the meaning of the term matter with special reference to the term ‘substance’.
Solids possess very high kinetic energy.
Gases change to liquid by the process of ______.
Define the term matter.
