JEE MAIN - Chemistry (2017 - 9th April Morning Slot - No. 9)
Which of the following ions does not liberate hydrogen gas on reaction with dilute acids ?
Ti2+
V2+
Cr2+
Mn2+
Explanation
The third ionisation energy of Mn is too high due to
stable half filled 3d-orbital. Hence, it cannot further get oxidised
to liberate hydrogen.
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