The combination in Option D , NaCl + HCl is not a buffer
A buffer is a solution which is added to resist changes in pH when a small amount of acid.
It is generally made of weak base with its conjugated acid , weak acid with its conjugated base.
A buffer comes with a defined with a capacity .
Among the given option the solution mixture which is not a buffer is
NaCl + HCl
as a buffer is not made of a strong acid and its salt.
Therefore Option D is not a buffer.
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