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Chemistry · PYQ NEET UG 2022
हिन्दीAt 298 K, the standard electrode potentials of \( \text{Cu}^{2+}/\text{Cu} \), \( \text{Zn}^{2+}/\text{Zn} \), \( \text{Fe}^{2+}/\text{Fe} \) and \( \text{Ag}^+/\text{Ag} \) are \( 0.34\text{ V} \), \( -0.76\text{ V} \), \( -0.44\text{ V} \) and \( 0.80\text{ V} \), respectively. On the basis of standard electrode potential, predict which of the following reaction CANNOT occur?
Correct answer · Option 2
\( 2\text{CuSO}_{4(aq)} + 2\text{Ag}_{(s)} \longrightarrow 2\text{Cu}_{(s)} + \text{Ag}_2\text{SO}_{4(aq)} \)
Explanation
A metal with a lower reduction potential can displace a metal with a higher reduction potential from its salt solution. Since Ag has a higher reduction potential (\( 0.80\text{ V} \)) than Cu (\( 0.34\text{ V} \)), Cu cannot displace Ag, hence reaction (B) cannot occur.
