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Which of the following electrolyte is used for the preparation of a general galvanic series?

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Which of the following electrolyte is used for the preparation of a general galvanic series?

(a) Polluted seawater

(b) Unpolluted river water

(c) Polluted river water

(d) Unpovlluted seawater

This question was posed to me in a national level competition.

The doubt is from Eight Forms topic in portion Eight Forms of Corrosion of Corrosion Engineering

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Right choice is (d) Unpovlluted seawater

Easy explanation: Galvanic series is the most accurate prediction of galvanic relationships of metals. It is based on potential measurements and galvanic corrosion tests in unpolluted seawater. This includes metals and alloys along with their active and passive states.

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