Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?

Which of the following ions does not liberate hydrogen gas on reaction with dilute acids?
  1. V2+
  2. Ti2+
  3. Mn2+
  4. Cr2+

Solution

Mn2+ does not displace H2 from dilute acid because they are less reactive SRP value. 

Given below are SRP values,
H2O|H2=-0.8277, Mn2+|Mn=-1.185 V

Asked in: JEE Main 2017 (09 Apr Online)

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