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प्रश्न
Distinguish by heating the following in dry test tubs.
Copper Sulphate and copper carbonate
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उत्तर
| Copper sulphate | Copper carbonate | |
| Residue left | Anhydrous(CuSO4) | Copper oxide(CuO) |
| Colour of residue | The colour of the residue is Dirty white. | The colour is black solid. |
| Gas produced | Water vapour (H2O) is produced. | Carbon dioxide(Co2) is produced. |
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संबंधित प्रश्न
What do you observe when Iron nail is kept in copper sulphate solution for sometime.
Give an example of a reaction where the following are involved
Electricity
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Give reason for the following:
A characteristic change of colour is seen when a piece of iron is added to copper [II] sulphate solution.
Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
The water we drink is a combination of hydrogen and oxygen.
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 |
Write the equation for the process of formation of rust.
