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प्रश्न
Zinc displaces hydrogen from acid solution (\[\ce{E^{\circ}_{Zn^{2+}/Zn}}\] = −0.76 V). Explain.
स्पष्ट करा
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उत्तर
Zinc displaces hydrogen from acid solution because it has a lower (more negative) standard reduction potential than hydrogen.
\[\ce{E^{\circ}_{Zn^{2+}/Zn}}\] = −0.76 V
\[\ce{E^{\circ}_{H^+/H_2}}\] = 0.00 V
Since zinc’s reduction potential is more negative, it is more easily oxidised than hydrogen. Thus, zinc donates electrons to H+ ions (from the acid), reducing them to hydrogen gas.
\[\ce{Zn_{(s)} + 2H^+_{ (aq)} −> Zn^{2+}_{ (aq)} + H2_{(g)}}\]
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