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Which aqueous M2+ ions are strong reducing agents that liberate hydrogen from dilute acid?
ANi2+, Cu2+ and Zn2+
BCo2+, Ni2+ and Cu2+
CTi2+, V2+ and Cr2+
DMn2+, Co2+ and Ni2+
Answer & Solution
Correct answer: C. Ti2+, V2+ and Cr2+
Ti2+, V2+ and Cr2+ have strongly negative M3+/M2+ potentials, so they reduce H+ to hydrogen gas.
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