Which one of the following combinations cannot function as a buffer solution?

a.) hcn & kcn

b.) nh3 & (nh4)2so4

c.) hno3 & nano3

d.)hf & naf

e.)hno2 & nano2

c.) HNO₃ & NaNO₃

Explanation:

A buffer system has 2 components:

Which one of the following combinations cannot function as a buffer solution?

a.) HCN & KCN. YES. HCN is a weak acid and CN⁻ (coming from KCN)  its conjugate base.

b.) NH₃ & (NH₄)₂SO₄. YES. NH₃ is a weak base and NH₄⁺ (coming from (NH₄)₂SO₄) its conjugate acid.

c.) HNO₃ & NaNO₃. NO. HNO₃ is a strong acid.

d.) HF & NaF. YES. HF is a weak acid and F⁻ (coming from NaF)  its conjugate base.

e.) HNO₂ & NaNO₂. YES. HNO₂ is a weak acid and NO₂⁻ (coming from NaNO₂)  its conjugate base.

i need mutiple choices

the answer is option a.