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A correct electrochemical series can be obtained from…

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A correct electrochemical series can be obtained from K, Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging

A. Al and Mg

B. Zn and Fe

C. Zn and Pb

D. Pb and H

QUICK ANSWER…

A

SOLUTION 

From the most reactive metal to the least reactive, lets rearrange the above series:

K > Na > Ca > Mg > Al > Zn > Fe > Pb > H > Cu > Hg > Ag > Au

Magnesium is quite more reactive than aluminum, that’s where the bug is.

Now for the right answer to the above question:

  1. Option A is correct. Aluminum is not more reactive than magnesium.
  2. Option B is incorrect. zinc and iron are properly arranged.
  3. C is incorrect. zinc and lead are properly arranged.
  4. D is not the correct answer. Lead and hydrogen are properly arranged.

QUICK TIPS…

You may please note these/this:

  • Electrochemical series is the use of standard electrode potentials to properly arrange ions from most reactive to least reactive.

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/ culled from 2018 JAMB-UTME Chemistry question 4 /

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