Exams › JEE Main › Chemistry

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest E° M3+/M2+ value ?

1. Cr(Z = 24)
2. Mn(Z = 25)
3. Fe(Z = 26)
4. Co(Z = 27)

Correct answer: Co(Z = 27)

Solution

Cobalt has a higher E° M3+/M2+ value compared to the other transition metals listed due to its favorable half-cell reduction potential, which is influenced by its electronic configuration and the stability of its oxidation states.

Related JEE Main Chemistry questions

• A transition metal M gives a volatile chloride whose vapour density is 94.8. If this chloride contains 74.75% chlorine by mass, what is the formula of the metal chloride?
• What is the ratio of the magnetic moments of Fe(III) and Co(II)?
• Which of the following species contains the greatest number of unpaired electrons?
• Which of the following species contains an atom in the +6 oxidation state?
• Which of the following pairs contains compounds in which the metal in each case is present in its maximum possible oxidation state?
• Among the following metal oxides, which one exhibits antiferromagnetic behavior?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →