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प्रश्न
Why do we need pure substances?
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उत्तर
We need pure substances because of the following reasons:
- A pure substance has a fixed melting and fixed boiling point.
- A pure substance has its characteristic taste, colour, and odour.
- Pure substances can not be broken further into more simple substances by any physical means.
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संबंधित प्रश्न
Differentiate between homogeneous and heterogeneous mixtures with examples.
Name the process you would use to separate a mixture of two miscible liquids (like acetone and water).
Name one pair of substances whose mixture can be separated by fractional distillation.
How will you separate common salt, sand and iron filings from their mixture ?
How will you separate a mixture of kerosene oil and water ? Explain with the help of a labelled diagram.
List four characteristics of a mixture.
Write “true” or “false” for the following statement
Jewellery gold is a homogeneous mixture of metals.
Write “true” or “false” for the following statement
Air can be separated from water by filtration.
Tick (√) the correct alternative from the choice given for the following statement:
A heterogeneous mixture is
Give a reason for the following statement:
Gunpowder is an example of a heterogenous mixture.
