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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
विकल्प
copper
aluminium
iron
gold
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उत्तर
iron
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
Write true or false for the statement
Decomposition of leaves is a fast change.
Photosynthesis cannot take place at night.
State whether the following is physical or chemical changes.
(energy produced) dissolving sugar in water —
Write true or false
Earthquake is a desirable change.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
Fill in the blank with the correct word of the statement given below:
Sublimation involves a __________ change.
Name the following:
The type of change physical or chemical involved – ‘when a substance undergoes a change in state, colour or size’.
When ice melts to form water, change occurs in its
Assertion: The explosion of fire cracker is a physical change.
Reason: A physical change is a reversible change.
