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Chemical Changes and Reactions — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYChemical Changes and Reactions1 Mark
Question
Give an example of double displacement reaction, where a gas is evolved.
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Answer

$\mathrm{Na}_2 \mathrm{~S}+2 \mathrm{HCI} \longrightarrow 2 \mathrm{NaCI}+\mathrm{H}_2 \mathrm{~S} \uparrow$

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