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प्रश्न
The smallest unit of matter that exists freely in nature is called ...........
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उत्तर
The smallest unit of matter that exists freely in nature is called molecule.
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संबंधित प्रश्न
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.
Name a metal which is yellow in colour.
Which of the following statements are true for pure substances ?
- pure substances contain only one kind of particles
- pure substances may be compounds or mixtures
- pure substances have the same composition throughout
- pure substances can be exemplified by all elements other than nickel
Which of the following does not have a fixed melting point/boiling point ?
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 general name of the process by which tea-leaves are separated from prepared tea ?
A teabag placed in a cup of hot water will diffuse into the water.
The phenomenon of Evaporation takes place at the ______ of a liquid.
