__________ treatment is done for appreciable improvement in viscosity index of lubricating oil. Options: A . &nbspAcid B . &nbspSolvent extraction C . &nbspAlkali D . &nbspClay

__________ treatment is done for appreciable improvement in viscosity index of l

Question

__________ treatment is done for appreciable improvement in viscosity index of lubricating oil.

Options:

A . Acid

B . Solvent extraction

C . Alkali

D . Clay

Answer: Option B

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