The concept of pH was put forward by:

Arrhenius

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Lewis

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Sorensen

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Bronsted and Lowry

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Solution

The correct option is C Sorensen
Soren Peder Lauritz Sorensen studied the effect of ion concentration on proteins. He realized that the concentration of hydrogen ions was particularly important and hence he introduced the pH-scale. According to him, pH scale was a simple way of expressing it.
Hence, option $C$ is correct.

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