Common free ion in the cell is

Iron

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Potassium

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Sulphate

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Phosphate

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Solution

The correct option is A Potassium
Potassium is an essential mineral micronutrient and is the main intracellular ion for all types of cells. It has a major role in the maintenance of fluid and electrolyte balance. It is common free ion in the cell absorbed in the form of K+. It is required in large amount for growth and reproduction in plants.
So the correct answer is 'Potassium'.

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