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प्रश्न
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
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उत्तर
A compound is a pure substance made up of two or more different elements [atoms] combined chemically in a fixed proportion.
Since one carbon atom and two oxygen atoms combine to generate one carbon dioxide molecule (CO2), we refer to the combination of carbon and oxygen as occurring in a fixed ratio of 1 : 2 to form carbon dioxide.
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संबंधित प्रश्न
State four differences between compounds and mixtures.
Give two examples of the following.
Elements which are liquids
State the number of atoms of CaCO3
Indicate whether the following statement is true or false:
Metals can be polished.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Complete the statement given below by filling in the blank with the correct word.
The basic unit of an element is an __________.
Explain the difference between Atoms and molecules.
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.
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
Give an example of each mixture having the following characteristics. Suggest a suitable method to separate the components of this mixture
Two or more coloured constituents are soluble in some solvent.
