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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
पर्याय
the same physical state
the same colour
the same composition
a definite set of properties
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उत्तर
a definite set of properties
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संबंधित प्रश्न
What are the advantages of chromatography?
Fill in the blank
A metal which is a liquid at room temperature is _______.
Fill in the blank
A diatomic gaseous element is _______.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name - a poisonous gas almost as heavy as air.
Give the name of the radical - OH
Write the names of elements from the following symbol:
Cu
Write the names of elements from the following symbol:
Si
The diagram represents fractional distillation for the separation of mixtures. Answer the following :
- Can two immiscible liquids be separated by this process?
- Separation of liquids by this process is based on which physical property?
- If methyl alcohol & water are to be separated, which liquid would remain in flask ‘X’ after condensation.
- Give a reason for the above answer.
- State the purpose of the fractionating column in the apparatus.
Elements : Combine to form compounds :: Compounds : ______.
Higher Order Thinking Skills.
In the diagram given below, the circle, square and triangle represent the atoms of different elements.
Identify all combinations that represent
- molecule of a compound
- molecule of an element consisting of two atoms
- molecule of an element consisting of three atoms
