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JEE Mains · Chemistry · STD 12 - 2. Electrochemistry

\(\mathrm{V}, \mathrm{Cr}, \mathrm{Mn}\), और \(\mathrm{Co}\) के लिए मानक इलेक्ट्रोड विभव \(\left(\mathrm{M}^{3+} / \mathrm{M}^{2+}\right)\) क्रमश: \(-0.26 \mathrm{~V},-0.41 \mathrm{~V},+1.57 \mathrm{~V}\) और \(+1.97 \mathrm{~V}\) है। धातु आयन जो एक तनु अम्ल से \(\mathrm{H}_2\) को निर्मुक्त कर सकते हैं, वे है:

  1. A \(V ^{2+}\) तथा \(Mn ^{2+}\)
  2. B \(Cr ^{2+}\) तथा \(CO ^{2+}\)
  3. C \(V ^{2+}\) तथा \(Cr ^{2+}\)
  4. D \(Mn ^{2+}\) तथा \(Co ^{2+}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(V ^{2+}\) तथा \(Cr ^{2+}\)

Step-by-step Solution

Detailed explanation

Metal cation with \((-)\) value of reduction potential \(\left( M ^{+3} / M ^{+2}\right)\) or with \((+)\) value of oxidation potential \(\left( M ^{+2} / M ^{+3}\right)\) will liberate \(H _2\) Therefore they will reduce \(H ^{+}\) i.e \(V { }^{+2}\) and \(Cr ^{+2}\)
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