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प्रश्न
Give one difference between atoms and molecules.
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उत्तर
Atoms may or may not have independent existance. Molecules have independent existance.
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संबंधित प्रश्न
Fill in the blank :
The state of matter with definite volume and definite shape is called______
Name the terms for the change of vapour into a liquid.
Define the following term of Atom .
Name the property which allows metals to be hammered into thin sheets.
What is meant by saying that non-metals are brittle ?
What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?
State two physical properties on the basis of which metals can be distinguished from non-metals.
If 25 mL of acetone is present in 150 mL of its aqueous solution, calculate the concentration of solution.
How will you test whether a given solution is a colloidal solution ?
Fill in the following blanks with suitable words :
Miscible liquids are separated by .....................
How will you separate a mixture containing sand and sugar ?
How is cream separated from milk ?
What is fractional distillation ? What is the use of fractionating column in fractional distillation ?
The boiling point of liquid argon is :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
The most reactive metal is ______.
Liquids have ______.
Solids do not flow.
Gases do not diffuse very easily.
