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प्रश्न
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
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उत्तर
The elements that are sonorous are called metals.
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संबंधित प्रश्न
What are molecules ?
What is the scientific name of particles which make up mater?
Explain why steel is used to make railway lines.
Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into
(i) osmosis, and (ii) diffusion :
- swelling up of a raisin on keeping in water
- spreading of virus on sneezing
- earthworm dying on coming in contact with common salt
- shrinking of grapes kept in thick sugar syrup
- preserving of pickles in salt
- spreading of smell of cake being baked in the kitchen
- aquatic animals using oxygen dissolved in water during respiration
What are pure substances ? Give two examples of pure substances.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Draw a flow-chart for the schematic representation of different types of matter.
Out of a colloid, solution and a suspension :
which one has the largest particles ?
How much water should be added to 15 grams of salt to obtain 15 per cent salt solution ?
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate 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.
Which of the following can be called a suspension ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
Fill in the following blanks with suitable words :
If a mixture contains iron filings as one of the constituents, it can be separated by using a .......................
Draw a labelled diagram of the fractional distillation apparatus used for separating a mixture of alcohol and water.
Rusting of an article made up of iron is called
Solid is an arrangement of particles ______.
Define the term matter.
