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प्रश्न
Give an example of a chemical reaction for each of the following situations:
A change in colour is observed.
उत्तर
The reaction between copper sulphate and iron metal – blue solution of copper sulphate changes to the green solution of ferrous sulphate.
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संबंधित प्रश्न
Complete and balance the following chemical equations:
\[\ce{Pb(NO3)2->[heat]}\] _________
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
Explain the following reaction with one suitable example of Decomposition reaction
Give an example of a reaction where the following are involved
Catalyst
Give reason for the following:
Silver nitrate solution is kept in coloured bottles.
Write your observation and a balanced equation in the case of the following substances being heated.
Ammonium chloride
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Zinc carbonate.
A reaction between an acid and a base is called ______.
What is the use of indicator?
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 |
