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conjugate acid/base pair and pH of solution

5.Which of the following does NOT represent a conjugate acid/base pair

A. HC2H3O2 / C2H3O2-
B. HCN / CN-
C. H3O+ / OH-
D. HCL / CL-
E. All are conjugate pairs

Justify your answer and explain why the incorrect ones are false
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7. Which of these 0.10 mol/L solutions has a pH 7.00 ?

A. CuBr2 (aq)
B. Na2CO3 (aq)
C. KCL (aq)
D. KCN (aq)
E. NH4NO3 (aq)

Justify your answer and explain why the incorrect ones are false

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