Which of the following statements regarding osmosis is not correct?

It is common in liquids as well as in gases.

The correct answer is Option (4) → It is common in liquids as well as in gases.

1. “The direction of osmosis can be reversed if a pressure larger than the osmotic pressure is applied to the solution side.”
    Correct → This is the principle of reverse osmosis.
2. “Reverse osmosis is used in the desalination of seawater.”
    Correct → Widely used in water purification.
3. “It involves the movement of solvent across semi-permeable membranes only.”
    Correct → This is the definition of osmosis.
4. “It is common in liquids as well as in gases.”
    Incorrect → Osmosis occurs only in liquids, because it requires solvent flow through a semi-permeable membrane. Gases do not exhibit osmosis.