Standard Electrode Potentials

Q. The correct order of $E^0{M}^{2+}/M$ values with negative sign for the four successive elements Cr, Mn, Fe and Co is

1. Fe ›Mn›Cr›Co
2. Cr›Mn›Fe›Co
3. Mn›Cr›Fe›Co
4. Cr›Fe›Mn›Co.

Q. Classify the elements having atomic numbers as given below into three separate pairs on the basis of similar chemical properties. Give brief electronic explanation:$9,12,16,34,53,56$.

Q. Four seccessive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $E_{M^{3+}/M^{2+}}^0$ value?

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

Q. Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is excepted to have the highest $E^0{M}^{3+}/M^{2+}$ value?

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

Q. Which of the following elements have positive reduction potential?

1. Zn
2. Fe
3. All of these
4. Cu

Q.

For which element of first transition series the oxidation potential value
$(M\to M^{2+}+2e^{-})$ is lowest

1. Mn

2. Fe

3. Ni

4. Cu