Citric acid is added in the limit test for iron to provide

Options :
  1. Acidic medium
  2. To react with iron to produce a purple colour
  3. To form a complex with iron to prevent precipitation
  4. To react with acid radicals to prevent precipitation
Answer and Explanation :-

Answer: Option 3

Explanation:

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What great good, then, we are to expect and hope from participating in his divinity, when even his distress calms us and his weakness strengthens us.
-Augustine of Hippo Tractates on the Gospel of John