The standard electrode potential for V, Cr, Mn & Co are and , respectively. The metal ions which can liberate from a dilute acid are

Question

The standard electrode potential  for V, Cr, Mn & Co are  and , respectively. The metal ions which can liberate  from a dilute acid are

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Strategy:
 A metal ion can liberate  gas from an acid if it is a stronger reducing agent than hydrogen. Thermodynamically, this means the standard reduction potential for the couple () must be negative, as  is defined as 0 V.

Step 1: Analyze the reaction thermodynamics
The reaction is: 
For spontaneity, .

Step 2: Check given potential values
- :  (Negative)  Liberates 
- :  (Negative)  Liberates 
- :  (Positive)  Does not liberate
- :  (Positive)  Does not liberate

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