Which one of the following mixture does not act as a buffer solution?

Boric acid and borax

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Sodium phosphate & disodium hydrogen phosphate

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Sodium propionate and propionic acid

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Sodium acetate and sodium propionate

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Solution

The correct option is B Sodium acetate and sodium propionate
An acidic buffer contains equimolar quantities of weak acid and its salt with strong base. A basic buffer contains equinolar quantities of weak base and its salt with strong acid. Sodium acetate is a salt with strong base but sodium propionate is not weak acid, it is also a salt.

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