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प्रश्न
A kind of matter which can sublime is
विकल्प
water
plastic
milk
iodine
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उत्तर
iodine
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संबंधित प्रश्न
Match the following
| Column A | Column B | ||
| (a) | Molecules | (i) | Water boils |
| (b) | 100° C | (ii) | Evaporation |
| (c) | 0° C | (iii) | Changes from solid to gas |
| (d) | At all temperatures | (iv) | Matter |
| (e) | Camphor | (v) | Water freezes |
Gases have definite volume but no definite shape.
Which of the following materials fall in the category of a “pure substance”?
- Ice
- Milk
- Iron
- Hydrochloric Acid
- Calcium oxide
- Mercury
- Brick
- Wood
- Air
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?
Fill in the following blanks with suitable words :
An element is made up of only one kind of ........
State two physical properties on the basis of which metals can be distinguished from non-metals.
Name a non-metal :
- which is lustrous
- which is required for combustion
- whose one of the allotrophic forms is a good conductor of electricity. Name the allotrope.
- other than carbon which shows allotropy
- which is known to form the largest number of compounds
In the following set of substances, one item does not belong to the set. Select this item and explain why it does not belong to the set :
Hydrogen, Oxygen, Steam, Chlorine
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Name the different types of solutions. Give one example of each.
Fill in the following blanks with suitable words :
A heterogeneous mixture of liquid and solid is conveniently separated by...............
Write a method to separate a mixture of sand and potash alum.
How would you separate iodine from a mixture of iodine and common salt ?
Select the correct answer from A, B, C, D & E for the statement given below:
An atom or group of atoms _________ having a resultant charge.
State whether true or false. If false, correct the statement.
Oil and water are immiscible with each other.
Intermolecular space is maximum in ______.
Solid is an arrangement of particles ______.
The phenomenon of Evaporation takes place at the ______ of a liquid.
