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AIIMS 2015
Exam
AIIMS
Year
2015
Subject
Chemistry
Chapter
Electrochemistry

AIIMS 2015 · Chemistry · Electrochemistry

Assertion : Zinc displaces copper from copper sulphate solution....

Assertion : Zinc displaces copper from copper sulphate solution. Reason : The E298 K∘E_{298 \mathrm{~K}}^{\circ} of Zn\mathrm{Zn} is −0.76 V-0.76 \mathrm{~V} and that of Cu\mathrm{Cu} is +0.34 V+0.34 \mathrm{~V}.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIfboth assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

A. If both assertion and reason are true and reason is the correct explanation of assertion.

Step-by-step solution

:Zn(s)+Cu(aq)2+→Zn(aq)2++Cu(s)ECu2+/Cuo=0.34 V,EZn2+/Zn=−0.76 V\begin{aligned}& : \mathrm{Zn}_{(s)}+\mathrm{Cu}_{(a q)}^{2+} \rightarrow \mathrm{Zn}_{(a q)}^{2+}+\mathrm{Cu}_{(s)}\\ & \quad E_{\mathrm{Cu}^{2+}/ \mathrm{Cu}}^{\mathrm{o}}=0.34 \mathrm{~V},E_{\mathrm{Zn}^{2+}/ \mathrm{Zn}}=-0.76 \mathrm{~V} \end{aligned}Higher reduction potential of Cu2+\mathrm{Cu}^{2+} ion than Zn2+\mathrm{Zn}^{2+} ion shows that Cu2+\mathrm{Cu}^{2+} ion has more tendency to undergo reduction.
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