Ammonia is always added in this reaction. Which of the following must be incorrect?

Explanation

To solve the question regarding the addition of ammonia in the reaction involving a silver electrode cell, we need to evaluate the four statements provided and determine which one is incorrect. Let's go through each statement step by step.

### Step 1: Understand the Reaction
The primary reaction at the silver electrode involves the reduction of silver ions (Ag⁺) to silver metal (Ag). The standard reduction potential (E°) for this reaction is approximately +0.8 V.

### Step 2: Analyze the Addition of Ammonia
When ammonia (NH₃) is added to the silver electrode, it forms a complex ion, specifically [Ag(NH₃)₂]⁺. This complex has a different reduction potential, approximately +0.33 V.

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