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Which of the following type of compounds act as an inhibitor for hydrogen-ion reduction?

Which of the following type of compounds act as an inhibitor for hydrogen-ion reduction? Correct Answer Sulfide ions, phosphorous and arsenic compounds

Hydrogen atoms diffuse into steel and other metals, which results in hydrogen blistering and hydrogen embrittlement. These inhibitors such as sulfide ions (polysulfide ion), phosphorous, and arsenic compounds reduce the rate of hydrogen-ion reduction.

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