The gas molecules are held on solid surface by _________ in physical a – McqOptions

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1.	The gas molecules are held on solid surface by _________ in physical adsorption.
A.	Chemical forces
B.	Gravitational forces
C.	Electrostatic forces
D.	Vander Waal‚Äö√Ñ√∂‚àö√ë‚àö¬•s forces
Answer» E.

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