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प्रश्न
Classify the following into metals, non-metals and metalloids:
Silicon, Mercury, Diamond, Sulphur, Iodine, Germanium, Sodium, Carbon, Magnesium, Copper, Boron, Helium
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उत्तर
Metals: Mercury, sodium, magnesium, copper
Non-metals: Diamond, sulphur, iodine, carbon, helium
Metalloids: Arsenic, germanium, boron
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संबंधित प्रश्न
Differentiate between an atom and a molecule.
Explain why air is used to inflate tyres.
Explain why steel is used to make railway lines.
Name one solid, one liquid and one gaseous non-metal.
Name one element, one compound and one mixture.
Fill in the following blanks with suitable words :
The elements which are sonorous are called ..........................
What are pure substances ? Give two examples of pure substances.
Name a metal which is yellow in colour.
You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?
Which of the following is not an emulsion ?
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..............
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How will you separate water from mustard oil ?
How is cream separated from milk ?
The boiling point of liquid argon is :
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
| (A) | (B) | ||
| (a) | degree celsius | (i) | kilogram |
| (b) | centimetre | (ii) | pascal |
| (c) | gram per centimetre cube | (iii) | metre |
| (d) | bar | (iv) | kelvin |
| (e) | milligram | (v) | kilogram per metre cube |
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
Solids do not flow.
Examples of foam are ______.
Define the term matter.
