Verified Solution • 2025–26 Session moderate

QJEEM23Chd296: JEE Main 2023 Chemistry - Class 12 JEEM23Chd296 Solution: The standard electrode potential ( M 3 + / M 2 + ) for V, Cr,…

The standard electrode potential (M3+/M2+) for V, Cr, Mn & Co are −0.26 V, −0.41 V, + 1.57 V and + 1.97 V, respectively. The metal ions which can liberate H2 from a dilute acid are :

Multiple Choice Options

  • A Mn2+ and Co2+
  • B V2+ and Mn2+
  • C V2+ and Cr2+
  • D Cr2+ and Co2+

Step-by-Step Verified Solution

Metal cation with (−)(-) value of reduction potential (M+3/M+2)\left(\mathrm{M}^{+3} / \mathrm{M}^{+2}\right) or with (+)(+) value of oxidation potential (M+2/M+3)\left(\mathrm{M}^{+2} / \mathrm{M}^{+3}\right) will liberate H2\mathrm{H}_{2}

Therefore they will reduce H+\mathrm{H}^{+} i. e V+2\mathrm{e~V}^{+2} and Cr+2\mathrm{Cr}^{+2}

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