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

Answers (1)

The reactivity of transition metals decreases from Ti?????2+ to V??????2+ Ito Cr?????2+ and finally Mn2+. Therefore, the reactivity of Mn2+ is very less. Therefore, Mn?????2+ does not liberate hydrogen gas on reaction with dilute acids. 

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