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प्रश्न
Write true or false
Rusting of iron is a chemical change.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Fill in the blank.
Heat is .................... by a gas during the process of condensation.
True or false
In a physical change no net energy change is involved.
Write true or false
A natural change can also be a desirable change.
Give two examples of periodic changes.
Classify the following as physical or chemical change :
Condensation of steam
Classify the following as a physical or a chemical change.
Manufacture of salt from sea water
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
State why addition of sodium chloride to water is considered a physical change, while addition of dilute sulphuric acid to zinc is considered a chemical change.
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 |
