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Hi Ahmed, let's solve this chemistry question about gas drying together. The question asks what substance is used to dry ammonia gas from moisture.

Ammonia gas, or N H three, is a basic gas. When we want to dry a gas, we must choose a drying agent that does not react with it.

Let's examine the options. Option A is potassium hydroxide solution. While it's basic, a solution contains water, so it cannot be used as a drying agent.

Option D is concentrated sulfuric acid. Since ammonia is a base and sulfuric acid is a strong acid, they will react to form ammonium sulfate. This means we would lose the gas entirely.