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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
Intermolecular space is maximum in .......... less in ............ and the least in .........
Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............
Describe in your own words, what happens to the particles when salt dissolves in 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.
Classify the following into elements and compounds :
- H2O
- He
- Cl2
- CO
- Co
Name a metal which can be easily cut with a knife.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
State whether the following statement is true or false :
Bread is an example of solid foam.
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
Milk of Magnesia is :
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.
With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
Explain how, nitrogen , oxygen and argon gases are separated from air.
Which of the following mixture cannot be separated by using water as the solvent ?
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 |
The physical state of water at 373 K is ______.
Define the term matter.
