Which of the following has the highest water potential $(Ψ)$ ?

1 M salt solution

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1 M sugar solution

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1 M sugar solution with 2.3 bars pressure applied on it

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Distilled water

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Solution

The correct option is D Distilled water
Water potential depends on the number or concentration of water molecules. More the number of water molecules in a system, higher will be the water potential. Hence, pure water has highest water potential. By convention water potential of pure water has been fixed as zero. This means that water potential of any solution will always be negative.

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