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The standard electrode potentials (E(M^(...

The standard electrode potentials `(E_(M^(+)//M)^(@))` of four metals A, B, C and D are `-1.2V, 0.6V, 0.85 V and -0.76V`, respectively. The sequence of deposition of metals on applying potential is

A

`B gt D gt C gt A`

B

`A gt C gt B gt D`

C

`C gt B gt D gt A`

D

`D gt A gt B gt C`

Text Solution

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The correct Answer is:
To determine the sequence of deposition of metals A, B, C, and D based on their standard electrode potentials, we will follow these steps: ### Step 1: List the Standard Electrode Potentials We are given the standard electrode potentials for the metals: - Metal A: \( E_{A}^{\circ} = -1.2 \, V \) - Metal B: \( E_{B}^{\circ} = 0.6 \, V \) - Metal C: \( E_{C}^{\circ} = 0.85 \, V \) - Metal D: \( E_{D}^{\circ} = -0.76 \, V \) ### Step 2: Understand the Relationship Between Electrode Potential and Reducing Power The standard electrode potential indicates the tendency of a metal ion to gain electrons (be reduced). A higher (more positive) electrode potential means a greater tendency to be reduced, while a lower (more negative) electrode potential indicates a stronger reducing power (greater tendency to lose electrons). ### Step 3: Rank the Metals by Reducing Power To find the sequence of deposition, we need to rank the metals based on their reducing power, which is inversely related to their standard electrode potential: - Higher \( E^{\circ} \) means lower reducing power. - Lower \( E^{\circ} \) means higher reducing power. **Ranking the Metals:** 1. Metal B: \( 0.6 \, V \) (lowest reducing power) 2. Metal C: \( 0.85 \, V \) 3. Metal D: \( -0.76 \, V \) 4. Metal A: \( -1.2 \, V \) (highest reducing power) ### Step 4: Determine the Sequence of Deposition The sequence of deposition will be from the metal with the highest reducing power (most negative potential) to the lowest reducing power (most positive potential): - A (most negative, highest reducing power) - D - C - B (least negative, lowest reducing power) ### Final Sequence of Deposition Thus, the sequence of deposition of metals on applying potential is: **A, D, C, B**
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