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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
Name the terms for the change of a solid into liquid.
All kinds of matter
Fill in the following blank with suitable words :
The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................
Name one solid, one liquid and one gaseous non-metal.
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
What are the three general classes of matter ? Give one example of each type.
Which of the following contains less solute at a given temperature and pressure ? Unsaturated solution or Saturated solution.
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
How will you test whether a given solution is a colloidal solution ?
Explain what happens when a beam of light is passed through a colloidal solution.
21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.
What is the difference between colloids and suspensions ?
What difference in the property of two miscible liquids enables their separation by fractional distillation ?
State whether the following statement are true or false :
Salt and water can be recovered from an aqueous salt solution by the process of evaporation.
Name the process which can be used to purify an impure sample of copper sulphate.
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
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
In Aerosol the dispersed phase is liquid and the dispersion medium is gas.
Boiling refers to the process by which a substance changes from the liquid to the gaseous state at its ______ point.
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
