Multiple choice

The rate and extent of corrosion do not depend upon

  1. position in galvanic series

  2. relative areas of anodic and cathodic parts

  3. position in electrochemical series

  4. purity of metal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This option is correct because electrochemical series does not provide a generalization to the rate of corrosion of elements as per their position in electrochemical series. For example: In Zn-Al couple, zinc is corroded and Al behaves as cathodic part. However, Al is above Zn in electrochemical series, which is due to the fact that Al develops strongly adhering oxide layer on its surface, thereby making effective electrode potential more positive.

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