Standard Electrode Potentials

Q.

Define ionic mobility. Explain the factors affecting ionic mobility. How is it related to transport number?

Q.

Arrange the following according to the instructions: ${\mathrm{Mg}}^{+2},{\mathrm{Cu}}^{+2},{\mathrm{Na}}^{+},{\mathrm{H}}^{+}$ (In the order of preferential discharge at the cathode).

Q. The correct option(s) to distinguish nitrate salts of $M{n}^{2+}$ and $C{u}^{2+}$ taken separately is (are)

1. $M{n}^{2+}$ shows the characteristic green colour in the flame test
2. Only $C{u}^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in acidic medium
3. Only $M{n}^{2+}$ shows formation of precipitate by passing $H_{2}S$ in faintly basic medium
4. $C{u}^{2+}/Cu$ has higher reduction potential than $M{n}^{2+}/Mn$ (measured under similar conditions)

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

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

Q. $E_{A{g}^{+}|Ag}^{\circ }=0.8$ volt and $E_{Z{n}^{2+}|Zn}^{\circ }=-0.76$ volt

Which of the following is correct?

1. $A{g}^{+}$ can be reduced by $H_2$
2. $Ag$ can oxidize $H_2$ into $H^{+}$
3. $Z{n}^{2+}$ can be reduced by $H_2$
4. $Ag$ can reduce $Z{n}^{2+}$ ion

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

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. Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because

1. zinc has lower negative electrode potential than iron
2. zinc has higher negative electrode potential than iron
3. zinc is lighter than iron
4. zinc has lower melting point than iron

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

Q. The correct option(s) to distinguish nitrate salts of $M{n}^{2+}$ and $C{u}^{2+}$ taken separately is (are)

1. $M{n}^{2+}$ shows the characteristic green colour in the flame test
2. Only $C{u}^{2+}$ shows the formation of precipitate by passing $H_{2}S$ in acidic medium
3. Only $M{n}^{2+}$ shows formation of precipitate by passing $H_{2}S$ in faintly basic medium
4. $C{u}^{2+}/Cu$ has higher reduction potential than $M{n}^{2+}/Mn$ (measured under similar conditions)

Q. 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 $E_{M^{3+}/M^{2+}}^0$ value?

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