For a surface molecule ……..

1.	For a surface molecule ……..
Answer» the net force on it is zero. there is a net downward force the potential energy is less than that of a molecule inside. the potential energy is more than that of a molecule inside Solution : Let US consider a molecule A asthe CENTRE of sphere of molecular action inside the liquid .The net force on this sphere is zero .A sphere of molecular action at the surface of liquid having half of its spere is OUTSIDE .The liquid contains the MOLECULES of air and liquid vapor and half its part is inside the liquid .Hence ,this molecule is under the influence of downward resultant force .(OPTION B) The potential energy of molecule B is more than inside molecule A (Option D)

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