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प्रश्न
Separate the following into physical and chemical changes :
Sublimation of a solid, Decomposition of water into hydrogen and oxygen by passing electric current, Formation of clouds, Making a fruit salad from raw fruits, Dissolving carbon dioxide in water
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उत्तर
Physical change: Sublimation of a solid, making a fruit salad from raw fruits, formation of clouds, and dissolution of carbon dioxide in water Chemical change: Decomposition of water into hydrogen and oxygen by passing electric current (electrolysis)
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Write true or false for the statement.
Burning of paper and formation of curd are reversible changes
True or false
Dissolving of a solid in liquid is a physical change.
What are man-made changes ?
Define a chemical change. Give two examples of the above changes.
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Give a reason why rusting of iron is a chemical change but, the magnetization of iron is a physical change.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Water is the universal solvent. Why?
