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The hydrogen-ion concentration of a 0.04 M solution of HCN is

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The hydrogen-ion concentration of a 0.04 M solution of HCN is 

Ka (HCN) = 4.9 x10–10

A. 16 x10–12 

B. 4 x10–6 

C. 2 x10–5 

D. 1 x10–4 

E. 4 x10–2

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Correct option  (B) 4 x 10–6

Explanation:

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