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प्रश्न
Classify the following as physical or chemical properties
Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.
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उत्तर
Chemical property
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संबंधित प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
Balance the following equation :
Fe + H2O → Fe3O4 + H2
Give reason for the following:
Molybdenum is used in the manufacture of ammonia.
Give a chemical test to distinguish between the following gases.
HCl and Cl2
Select the correct answer for the following options:
The black residue obtained on heating copper 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.
Give balanced equation for the following conversion affected by heat alone on the substance:
Zinc carbonate to zinc oxide
Explain the following statement: Digestion is a chemical change.
Photosynthesis is a chemical reaction that takes place in the presence of ______.
Match the following:
| Column I | Column II | ||
| 1. | Burning of coal | a. | Rusting |
| 2. | Painting of a surface | b. | Evaporation |
| 3. | Dipping iron in the water | c. | Chemical change |
| 4. | Salt from seawater | d. | Prevention of rusting |
