Standard Electrode Potentials

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. Copper can displace hydrogen gas from dilute acids – True or False?

1. True
2. False

Q. An element X occurs in short period having configuration $n{s}^{2}n{p}^1$. The formula and nature of its oxide is

1. X₂O₃ amphoteric

2. X₂O₃, basic

3. , basic
4. , acidic

Q. The oxidation state of mercury in amalgam, calomel and corrosive sublimate is:

1. 0, +1, +2
2. +1, +1, +2
3. +1, +2, +1
4. 0, +1, +1

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. What is the standard electrode potential for the electrode, $Mn{O}_4^{-}|Mn{O}_2$ in an acid solution?


$E_{Mn{O}_4^{-}/M{n}^{2+}}^0=1.51V{E}_{Mn{O}_2/M{n}^{2+}}^0=1.23V$

1. 
   $2.45V$
2. $3.35V$
3. 
   $0.87V$
4. 
   $1.70V$

Q. What is oxidisation of "O" in potassium superoxide:

1. -2
2. -1
3. $\frac{-1}{2}$
4. 1

Q. The trend in electrode potential $\left(E^0\right)$ values of the 3d series is irregular – True or False?

1. True
2. False

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)

Q. Consider the following standard electrode potentials ($E^0$ in volts) in aqueous solution:

Element	$M^{3+}/M$	$M+/M$
AI	$-1.66$	$+0.55$
TI	$+1.26$	$-0.34$

Based on these data, which of the following statements is correct?
(JEE Main 2017)

1. $T{l}^{+}$ is more stable than $A{l}^{+}$
2. $T{l}^{3+}$ is more stable than $A{l}^{3+}$
3. $T{l}^{+}$ is more stable than $A{l}^{3+}$
4. $A{l}^{+}$ is more stable than $A{l}^{3+}$