Advertisements
Advertisements
प्रश्न
What are the characteristic properties of a pure substance? Why do we need them?
Advertisements
उत्तर
Pure substance : Pure substances have a definite set of properties such as boiling point, melting point, density, etc. They are all homogeneous i.e., their composition is uniform throughout the bulk. Both elements and compounds are pure substances.
Pure substances are needed to :
- Manufacture medicines.
- To prepare chemicals in industry.
- For scientific purposes.
- To maintain the good health of human beings.
APPEARS IN
संबंधित प्रश्न
Define :- Immiscible liquids
‘‘The properties of the product are different from those of the constituents''. State whether this statement best describes an element, a compound or a mixture.
Give reason:
Why do sugar and water retain their individual properties in a sugar solution?
Give two examples of the following type of mixture.
gas-gas
Name four substances that can be used as filters.
Write “true” or “false” for the following statement
Jewellery gold is a homogeneous mixture of metals.
Tick (√) the correct alternative from the choice given for the following statement:
A gas dissolved in a liquid can be separated by
Give a reason why sublimable and non-sublimable substances can be separated easily, but two sublimable substance cannot.
State whether the following statement is true or false. If false write – the correct statement.
Components in a mixture are present in a definite proportion.
Write scientific reason.
Lemon sherbet has a sweet, sour and salty taste, and it can be poured into a glass.
