[" Which one of the following mixture does not act as a "],[" buffer solution- "]

Which of the following mixtures can act as buffer?

Which one of the following mixtures is a solution ?

Which of the following mixtures will act as buffer?

Which of the following mixture can act as a buffer?

Which of the following mixture constitute a buffer?

Which will act as a buffer solution

Which will act as a buffer solution

Which one of the following mixtures is suitable for making a buffer solution will an optimum pH of 9.2 - 9.3 ?