Need chemical composition of Electrolytic chrome plating

A. Hello Raghavendra.
Chrome plating is essentially pure chromium metal, with perhaps a very tiny amount of contaminants. However, when most people speak of chrome plating they actually mean decorative nickel-chrome plating, which consists of a relatively heavy layer(s) of nickel (10 to 40 microns) underneath a thin (less than a half micron) layer of chromium. It's difficult to know exactly what you want, but please see our Intro to Chrome Plating so we can better understand each other.

Sorry, but public forums aren't great for urgent requirements as expert readership can't be mobilized instantly to address your needs, but wanders in and out on its own daily, weekly, or monthly schedule :-)

Ted Mooney, P.E.
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finishing.com - Pine Beach, New Jersey

A. As stated by you, the make up of chrome is 99.9+++% chromium metal with a valence state of zero.
The most common plating bath (but far from the only one) is water, chromic acid and sulfuric acid.
If you are really asking how much hexavalent chrome is in the part, that is zero%. If you are asking how much hex chrome is on the part, that is highly variable, depending on surface finish, shape and quality of rinsing/neutralization.