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प्रश्न
The three important metalloids are.............................. and ..........................
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उत्तर
The three important metalloids are boron, silicon, and germanium.
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संबंधित प्रश्न
Define the term matter. What is it composed of?
Differentiate between an atom and a molecule.
What are the two conditions for the interconversion of states of matter ?
Define the following term of Atom .
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
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
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
What are the three groups into which all the elements can be divided ? Name two elements belonging to each group.
Name a metal which has no fixed shape.
Classify the following into elements, compounds and mixtures :
arble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk
What are the three general classes of matter ? Give one example of each type.
Which of the following does not have a fixed melting point/boiling point ?
Which of the following will show Tyndall effect ? Why ?
- Salt solution
- Starch solution
- Milk
- Copper sulphate solution
Define Foam Give one example.
One of the following liquids will leave behind a residue on heating. This one is :
What difference in the properties of oil and water enable their separation by a separating funnel ?
______ is a smallest particle.
A standard sheet of paper is about ______ of atoms thick
Define the term matter.
