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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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| List I | List II |
| 1. \[\ce{AB⇌[heat]A + B}\] | A: Double decomposition |
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|
3. \[\ce{X+Y- + AB+B- ->X+B- + A+Y-}\] |
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