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Which of the following metals that are spontaneously passivated on coupling with platinum?

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Which of the following metals that are spontaneously passivated on coupling with platinum?

(a) Titanium

(b) Chromium

(c) Titanium and Chromium

(d) Neither titanium nor chromium

I got this question in my homework.

The question is from Modern Theory Applications topic in division Modern Theory Applications of Corrosion Engineering

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Correct choice is (c) Titanium and Chromium

The explanation: Titanium and chromium metals are the metals that are spontaneously passivated on coupling with platinum. It is due to the mixed potential of galvanic couples lies in the protection region of the passive region.

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