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प्रश्न
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
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उत्तर
A mixture is an impure substance containing more than one element or compound, mechanically mixed together in any proportion and the mixture retains the properties of its constituents i.e. elements or compounds.
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संबंधित प्रश्न
Give one example for the following types of mixtures :
misicible liquids
Give two examples of Non-metals.
Give two examples of Metalloids.
Give two examples of Noble gases.
How is sodium chloride different from its constituent elements, sodium and chlorine in its properties? Justify.
What is meant by 2H and H2
Name: Three different forms of carbon
Name: Two substances used to make jewellery.
Give reason: Graphite is used to make a lead of the pencils.
Tick (√) the correct alternative from the choice given for the following statement.
All pure substances have
Give the name of the radical - NO3
Complete the statement with the correct words.
_______ are chemicals which are hydroxide (or oxides) of ______ eg. sodium hydroxide.
Write the names of elements from the following symbol:
Br
Explain the difference between Metals and non-metals.
Define the terms elements, compounds & mixtures with a view to show their basic difference.
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Select the correct answer from A, B, C, D & E for the statement given below :
A mixture consisting of elements & a compound.
Non-metal conducting electricity :______ :: Metal conducting electricity : Copper
Match the following.
| Atom | Building block of matter |
| Element | Atoms of different kinds |
| Compound | Atoms of the same kind |
| Molecule | Smallest unit of a substance |
