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

C r^{2 +}

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M n^{2 +}

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T i^{2 +}

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V^{2 +}

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Solution

The correct option is C $M n^{2 +}$
$M n^{2 +}$ does not liberate hydrogen gas on reaction with dilute acids. +2 oxidation state of $M n$ is very stable due to exactly half filled electronic configuration.

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

The correct option is C Mn2+Mn2+ does not liberate hydrogen gas on reaction with dilute acids. +2 oxidation state of Mn is very stable due to exactly half filled electronic configuration.

The correct option is C $M n^{2 +}$
$M n^{2 +}$ does not liberate hydrogen gas on reaction with dilute acids. +2 oxidation state of $M n$ is very stable due to exactly half filled electronic configuration.