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प्रश्न
State whether the following is physical or chemical changes.
respiration in living beings —
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उत्तर
chemical change,
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संबंधित प्रश्न
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
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.
Deforestation is a man-made change
What role does energy play in initiating a chemical change ?
Fill in the blank
Chemical change occurs as a result of __________ between two substances.
State whether the following is physical or chemical changes.
burning of sugar —
State whether the following is physical or chemical changes.
water cycle in nature —
State whether the following is physical or chemical changes.
mixing oil with water —
Which of the following are physical changes and which are chemical changes ?
Glowing of an electric bulb
Give an example to justify the statement that physical changes can be reversible as well as irreversible.
