  #### Henry's Law at constant temperature states that   Option 1) The solubility of gas in a liquid is directly proportional to the partial pressure of gas in solution. Option 2) Mole fraction of gas in solution is proportional to partial pressure of gas over solution  Option 3) Partial pressure of gas in vapour phase is proportional to mole fraction of gas in solution Option 4) All of these As learnt in

Henry's Law -

It decides the solubility of gases in liquids.  = mole fraction of gas in liquid. = Partial pressure of gas over liquid surface.

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Henry's law states that solubility of a gas in a liquid is directly proportional to partial pressure of gas. All the other options can be implied from above.

Option 1)

The solubility of gas in a liquid is directly proportional to the partial pressure of gas in solution.

This option is incorrect

Option 2)

Mole fraction of gas in solution is proportional to partial pressure of gas over solution

This option is incorrect

Option 3)

Partial pressure of gas in vapour phase is proportional to mole fraction of gas in solution

This option is incorrect

Option 4)

All of these

This option is correct