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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
Select the correct alternative
The molecules can move freely anywhere in
- gases
- liquids
- solids
- none of the above
Fill in the blank
Any matter which has a definite _______ but no definite shape is called a _______
Out of solids, liquids and gases, which one has :
- maximum movement of particles ?
- maximum interparticle attractions ?
- minimum spaces between particles ?
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 the property which enables metals to be drawn into wires.
What is meant by saying that non-metals are brittle ?
Name one element, one compound and one mixture.
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Define a compound. Give two points of evidence to show that sodium chloride is a compound.
Which of the following is not an element ?
The element which is not common between the compounds called baking soda and soda ash is
Which of the following are chemical changes and which physical ? Give reason.
- a glass bottle breaking
- coal burning in air
- making a cake
- wool being knitted into a sweater
Which one of the following is not a chemical change ?
Name the process which is used in milk dairies to separate cream from milk.
Name the process by which common salt is obtained from sea-water.
How would you separate iodine from a mixture of iodine and common salt ?
How will you separate water from mustard oil ?
Explain the meaning of the term ‘matter’.
Which among the following ______ will get attracted to by magnet?
Define the term matter.
