____________is a conjugate acid/base pair with differing spectral absorbencies.

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 A Chemical pH indicator
The conjugate acid/base pair with differing spectral absorbencies is chemical $p H$ indicator. So that, it can change colour if the medium is changed(indicator).

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