A solution has initially 0.1 M - HCOOH and 0.2 M - HCN. Ka of HCOOH = 2.56 * 10^-4, Ka of HCN = 9.6 * 10^-10. The only incorrect statement for the solution is (log 2 = 0.3)

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Prashant Kotian · Accepted Answer

Correct answer: D. [H+] is dominated by HCOOH. For an acidic solution, pH ≈ 2.8 means pOH = 14 - 2.8 = 11.2, not 2.8. Statement (d) is incorrect.

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