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Which of the following salt solutions would have the highest pH?

Compound $\quad K_a/K_b \quad \quad \quad \quad \quad \quad$
$HCN$ $K_a = 4.9 × 10^{-10} \quad \quad$
$HF$ $K_a = 3.5 × 10^{-4} \quad \quad $
$NH_3 $ $K_b = 1.76 × 10^{-5} \quad \quad$
A

$NaCl$

B

$KCN$

C

$NH_4Cl$

D

$NH_4F$

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