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What is the standard reduction potential value of potassium in the EMF series?

What is the standard reduction potential value of potassium in the EMF series? Correct Answer -2.925 V

Standard reduction potential values of metal are measured against SHE, which is arbitrarily defined as zero. Standard reduction potential of potassium (K-K+), aluminum (Al-Al+3), zinc (Zn-Zn+2), copper (Cu-Cu+2) are –2.925V, -1.662V, -0.763V and +0.337V respectively.

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