Please select a subject first
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What do you observe when :
an iron nail is kept in tap water for few days
Concept: undefined >> undefined
Fill in the blank
A new substance is always formed in a _______ change.
Concept: undefined >> undefined
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Fill in the blank.
Melting of ice is a _______ change.
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True or false
New substances are formed in a chemical change.
Concept: undefined >> undefined
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Concept: undefined >> undefined
Fill in the blank
A new substance is formed in a _______ change.
Concept: undefined >> undefined
Name the main metal present in the following:
Haemoglobin
Concept: undefined >> undefined
Name the main metal present in the following:
Chalk
Concept: undefined >> undefined
Name the main metal present in the following:
Chlorophyll
Concept: undefined >> undefined
Name the main metal present in the following:
Chocolate wrappers
Concept: undefined >> undefined
Give four examples of non-metallic elements.
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What do you understand by :
Metalloids
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State four difference between compounds and mixtures.
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Define:- Filtration
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Why is it named so?
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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
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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
Sedimentation and decantation
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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
By using a separating funnel
Concept: undefined >> undefined
Fill in the blank
_______ are made up of same kind of atoms.
Concept: undefined >> undefined
Fill in the blank:
________ and _______ are pure substances.
Concept: undefined >> undefined
