Advertisements
Advertisements
प्रश्न
The dyes present in fountain pen ink can be separated by the technique of :
विकल्प
fractional distillation
infrared photography
crystallisation
chromatography
Advertisements
उत्तर
chromatography
Chromatography is the technique used to separate the contents of a mixture, where solute particles are in extremely small quantity.
APPEARS IN
संबंधित प्रश्न
Fill in the blank
Liquids have a definite ______
What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.
When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.
- What could particles X be ?
- What do you think liquid Y is ?
- What is the zig-zag movement of X known as ?
- What is causing the zig-zag movement of particles X ?
- Name the scientist who discovered this phenomenon.
- What does this experiment tell us about the nature of liquid Y?
What is meant by saying that metals are malleable and ductile ?
Classify the following as elements or compounds :
Iron, Iron sulphide, Sulphur, Chalk, Washing soda, Sodium, Carbon, Urea
What elements do the following compounds contain ?
Sugar, Common salt
Draw a flow-chart for the schematic representation of different types of matter.
Which one of the following is not a metalloid ?
Choose the correct answer.
A 15% alcohol solution means :
What is a colloid ? Give two examples of colloids (or colloidal solutions)
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
A solid mixture contains four constituents P, Q, R and S. P consists of tiny grains and it is mixed with
cement for plastering the walls. Q is a white solid which is recovered on a large scale from sea water by the
process of evaporation. R is in the form of tiny particles of a material whose corrosion is called rusting. And
S is a white solid which is used in making ordinary dry cells.
- What could P, Q, R and S be ?
- How would you separate a mixture containing P, Q, R and S ?
Explain the meaning of the term ‘matter’.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
Which among the following is not a matter?
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
Atoms are tiny particles that repel each other when they are squeezed very close.
The phenomenon of Evaporation takes place at the ______ of a liquid.
