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प्रश्न
Fill in the blank:
________ and _______ are pure substances.
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उत्तर
Elements and compounds are pure substances.
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संबंधित प्रश्न
Name the main metal present in the following:
Chocolate wrappers
Give four examples of non-metallic elements.
What do you understand by :
Metalloids
Define:- Filtration
On what principle are the following methods of separation based? Give one example of a mixture for each of the methods mentioned in which they are used
Filtration
Fill in the blank.
_________ is used when the constituents of a mixture of solids have a difference in their weights.
Write true or false
All pure substances have characteristic melting and boiling points.
Differentiate between the following.
solution and suspension
What is centrifugation ? Also write the principle on which it works.
When two or more elements combine together they form ______.
