A conjugate acid/base pair with differing spectral absorbencies will act as:

chemical

p H

indicator

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acid/base buffer

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anhydrous solution

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hypotonic solution

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Solution

The correct option is A chemical $p H$ indicator
According to the definition of chemical pH indicator, it is a conjugate acid/base pair with differing spectral absorbencies.
A pH indicator is a halochromic chemical compound added in small amount to a solution to know it's pH.
Hence, the correct answer is option (A).

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