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प्रश्न
Give an example of double displacement reaction, where a gas is evolved.
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उत्तर
\[\ce{Na2S + 2HCI -> 2NaCI + H2S ↑}\]
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संबंधित प्रश्न
Complete the following statement.
In the type of reaction called_______________, two compounds exchange their positive and negative radicals.
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State the type of reactions for the following represent and balance the ones that are not balanced.
CuO+H2→ Cu+ H2O
What is a double displacement reaction?
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I.
| List I | List II |
| 1. Light green to black | A: Copper carbonate |
| 2. White to yellow [heated state] | B: Hydrated Copper sulphate |
| 3. Blue to black | C: Copper nitrate |
| 4. Orange to green | D: Ammonium dichromate |
| 5. Blue to white | E: Zinc nitrate |
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\[\ce{Cl2 + 2Kl->2KCl + l2}\]
The reaction can be classified as:
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\[\ce{4HNO3->4NO2 + 2H2O + O2}\]
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An acid – from sulphur dioxide gas
Name a metallic oxide which on thermal decomposition is reduced to metal.
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Decomposition reaction and a double decomposition reaction.
