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प्रश्न
Write true or false for each statement. Rewrite the false statement correctly.
Matter cannot exist in different states.
पर्याय
True
False
उत्तर
False.
Matter can exist in different states.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
Intermolecular space is maximum in .......... less in ............ and the least in .........
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
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?
Name a metal which has a low melting point.
Name a metal which is yellow in colour.
Which of the following are not compounds ?
Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :
Which of the following can be called a suspension ?
What is the difference between colloids and suspensions ?
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Name the property of one of the constituents which can be used to separate a mixture of salt and iodine
What is the general name of the process by which tea-leaves are separated from prepared tea ?
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..............
The material which is added to water during purification process at the water works so as to disinfect it is :
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.
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.
Solid is an arrangement of particles ______.
Solids do not flow.
