The pressure required to prevent the entry of water into an osmotically active solution is called .

water pressure

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solute pressure

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osmotic pressure

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Solution

The correct option is C osmotic pressure
During osmosis, water will move from a region of low solute concentration to a region of high solute concentration across a semi-permeable membrane. This movement of water is to even out the concentrations on either side.
Osmotically active solution is the one wherein osmosis occurs.
The pressure applied to the osmotically active solution to prevent the entry of water into it is called osmotic pressure.

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Osmotic pressure is the maximum pressure that must be exerted to prevent the passage of solvent into the solution when the two are separated by a semi-permeable membrane.

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