Asolution containing which one of the following pairs of substances will be a buffer solution?
a. rbcl, hcl
b. csf, hf
c. kbr, hbr
d. nai, hi
e. none of the above

The pairs of molecules which can form buffer solution are CSF,HF.

Explanation:

A buffer solution can only be formed by substances which are either weak acid or weak bases and mixing them with there corresponding conjugate base or conjugate acid.

Since HCl is a strong acid so the buffer solution cannot be formed using this strong acid. RbCl would provide the conjugate base anion Cl⁻ but this solution of HCl and RbCl  cannot form buffer as HCl is a strong acid.

Since HF is a weak acid and hence it can form a buffer solution by mixing this weak acid with its conjugate base anion F⁻So a solution of HF and CsF would form a buffer solution. CsF would provide F⁻ ion.  

HBr is also a strong acid and hence it will also not be able to form buffer solution on mixing it with its conjugate base anion Br⁻.

HI is very strong acid and hence it would not be able to form buffer solution on mixing it with its conjugate base anion I-.

can you list the answers so i can answer

the answers would be

the first one and the second one