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प्रश्न
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
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उत्तर
Silver nitrate solution is kept in a laboratory in coloured reagent bottles because if kept in a colourless bottle, it will react with sunlight, causing oxidation and decomposition to silver oxide.
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संबंधित प्रश्न
Give an example of the following chemical change.
Two solids combine to form a liquid
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Give an example of the following chemical changes.
A reaction where colour change is noticed.
Give one example electrochemical reaction.
Distinguish by heating the following in dry test tubs.
Ammonium Chloride and iodine.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Explain the following statement: Digestion is a chemical change.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
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 |
