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प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Condensation of steam is not a chemical change.
विकल्प
True
False
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उत्तर
This statement is True.
Explanation:
Steam condensation is a physical change, as it involves a change of state from gas to liquid without altering the chemical composition.
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संबंधित प्रश्न
TRUE \ FALSE
Ammonia is a good oxidizing agent.
Fill in the blank:
During a chemical reaction transfer of ________ takes place.
Give an example of a reaction where the following are involved
Pressure
Give an example of the following chemical changes.
A reaction where colour change is noticed.
State the original colour of the following substance and colour of residue obtained after heating.
Copper carbonate
Distinguish by dilute sulphuric acid.
Sodium Sulphite and sodium carbonate?
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Addition of dilute hydrochloric acid to silver nitrate.
Complete the table given below.
| Addition of dil. H2SO4 to KHCO3 | Name of residue obtained |
What is the role of a catalyst in a chemical reaction?
Magnesium + oxygen → magnesium oxide.
2Mg + O2 → 2Mg O
