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प्रश्न
Classify the following as chemical or physical change:
Passing of electric current through water, and water breaking down into hydrogen and oxygen gases.
पर्याय
Chemical change
Physical change
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उत्तर
Chemical change
Explanation:
The passage of electric energy through water to form hydrogen and oxygen gases is a chemical change because the properties of hydrogen (a combustible gas) and oxygen (a supporter of combustion) are completely different from those of water, which is neither combustible nor a supporter of combustion but does extinguish the fire.
संबंधित प्रश्न
Write true or false for the statement.
Dissolving of solute in a solvent and rusting of iron are both physical changes.
State three differences between evaporation and boiling
Tick the most appropriate answer.
Physical changes are
Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following statements concerning X, Y and P are correct ?
- P is a compound
- X and Y are compounds
- X and Y are elements
- P has a fixed composition
Classify the Following as a Physical Or a Chemical Change.
Curdling of Milk
Give four difference between physical and chemical changes.
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs – a physical change or a chemical change. Give reasons.
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
What type of energy changes is associated when ice melts?
Adding sugar to milk is a physical change.
