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प्रश्न
Select the chemical changes from the following list of changes
Breaking of glass
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उत्तर
Breaking of glass is a PHYSICAL change as no change in composition takes place, no new substance is formed.
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Boiling of water to form steam.
State whether the following is physical or chemical change.
Digestion of food —
Write true or false
Burning of paper and formation of curd are reversible changes.
Photosynthesis cannot take place at night.
A physical change is temporary. Explain.
Classify the Following as a Physical Or a Chemical Change.
Making of a Sugar Solution
Give reasons why – separation of mixtures e.g. iron from a mixture of iron and sulphur is a physical change, but heating a mixture of iron and sulphur is considered a chemical change.
Potassium chloride is added to water and stirred. A salt solution is obtained, which is then boiled, leaving behind a residue.
- Is the above change physical or chemical?
- Name the residue which remains behind after the salt solution is boiled.
- Is the change reversible or not reversible?
- Are the composition and properties of the original substance altered?
- Give a reason why the above experimentation would not be possible if calcium carbonate was taken in place of potassium chloride.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
Match the items of Column I with the items of Column II.
| Column I | Column II | ||
| (a) | Large crystals | (i) | Turns lime water into milky |
| (b) | Depositing a layer of zinc on iron | (ii) | Physical change |
| (c) | Souring of milk | (iii) | Rust |
| (d) | Carbon dioxide | (iv) | Sugar candy (Mishri) |
| (e) | Iron oxide | (v) | Chemical change |
| (f) | Dissolving common salt in water | (vi) | Galvanisation |
