The different spectral absorbencies of a conjugate acid/base pair is a/an:

chemical pH indicator

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acid/base buffer

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anhydrous solution

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hypotonic solution

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supersaturated solution

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Solution

The correct option is C chemical pH indicator
Chemical $p H$ indicators are chemical compounds that change color over a narrow range of $p H$ values. This is because they are the conjugate acid/base pairs with different spectral absorbensies, which causes change in its color when in contact with an acid/base due to chemical reactions

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