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प्रश्न
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
पर्याय
copper
aluminium
iron
gold
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उत्तर
iron
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संबंधित प्रश्न
Tick the most appropriate answer.
5. Photosynthesis requires
- heat energy.
- wind energy
- sunlight.
- sound energy
Melting of solid (wax) is a physical change.
Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.
Slow and fast change.
Fill in the blanks with the appropriate words of the statement given below:
Heating a piece of iron is considered a __________ change while heating a piece of coal [carbon] is considered a ___________ change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
Name the following.
The product obtained during a physical change when water converts from a liquid into a solid.
Name the following.
The product of the chemical change in keeping a polished iron nail exposed to the atmosphere.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
Do you think rust is different from iron?
Mention some of the different conditions needed for chemical changes to occur.
