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प्रश्न
What is meant by saying that non-metals are brittle ?
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उत्तर
Non-metals are brittle in nature, which means, they cannot be hammered into thin sheets. They will be broken into smaller pieces if hammered. E.g., sulphur and phosphorus.
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संबंधित प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
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 |
Define the following term of Matter .
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
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
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
Define solute.
What is a suspension ? Give two examples of suspensions.
One of the following does not show Tyndall effect. This one is :
One of the following liquids will leave behind a residue on heating. This one is :
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
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 ?
Asmita went to buy an earthen pot. There she saw many things kept for sale.
What is the difference between a substance and an object?
______ is not made of matter.
Celsius scale is a scale of temperature in which zero represents the melting point of ice and 100 represents the boiling point of water.
The phenomenon of Evaporation takes place at the ______ of a liquid.
Evaporation is always accompanied by ______ in temperature.
Write a scientific reason.
Lemon sherbat has a sweet, sour and salty taste and it can be poured in a glass.
