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प्रश्न
Write true or false
Cutting of paper into pieces is a chemical change.
पर्याय
True
False
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उत्तर
False
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संबंधित प्रश्न
Write true or false
Burning of sugar is a temporary change.
Tick (√) the correct alternative from the choice given for the following statement.
The compound rust is a hydrated oxide of
What are man-made changes ?
Classify the following as physical or chemical changes :
Breaking of a glass tumbler
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
Explain the term – ‘sublimation’. Is sublimation of naphthalene – a physical or a chemical change. Give reasons.
State whether the following statement is true or false. If false write the correct statement.
Melting of ice is an exothermic, irreversible chemical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Select the chemical changes from the following list of changes
Butter turning rancid
Select the chemical changes from the following list of changes
The crystallisation of salt from its solution.
