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प्रश्न
Fill in the following blanks with suitable words :
The gases of air can be separated by fractional distillation of liquid air because they have different..............
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उत्तर
The gases of air can be separated by fractional distillation of liquid air because they have different boiling points.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and 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.
During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :
Which of the following is a mixture ?
Salt, Air, Water, Alum, Sugar
What is meant by saying that metals are lustrous ?
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
State two physical properties on the basis of which metals can be distinguished from non-metals.
Which one of the following is not a metalloid ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Which of the following do not exhibit Tyndall effect ?
Starch solution, Sugar solution, Ink, Salt solution, Copper sulphate solution, Ammonium chloride solution, Fog, Smoke, Car exhausts.
One of the following is a solid foam. This one is :
One of the following represents the solution of solid in a solid. This one is :
Explain how, nitrogen , oxygen and argon gases are separated from air.
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 ?
______ is not made of matter.
Define the term matter.
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
The phenomenon of Evaporation takes place at the ______ of a liquid.
