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Which of these dipositive ions does NOT release hydrogen gas when treated with dilute acids?

1. Ti2+
2. Cr2+
3. Mn2+
4. V2+

Correct answer: Mn2+

Solution

Mn2+ has a stable half-filled 3d5 configuration and is not a reducing agent, so it cannot be oxidised by H+ and does not liberate H2, whereas Ti2+, V2+ and Cr2+ are strong reducing agents that release H2.

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