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Which of the following is the reagent?

1. Potassium ferrocyanide (K4[Fe(CN)6])
2. Sodium hypophosphite (Na2HPO2)
3. Potassium chromate (K2CrO4)
4. Potassium hydroxide (KOH)

Correct answer: Potassium hydroxide (KOH)

Solution

Potassium hydroxide is a common reagent used in coordination chemistry and qualitative analysis because it provides a strongly alkaline medium. The other options are not the intended reagent here.

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