Consider two acids HCN and HNO2:
HNO2 + H2O <---------> NO2- + H3O+ Ka = 5.1 x 10-4
HCN + H2O <-----> CN- + H3O+ Ka = 2.1 x 10-9
Which of the following statements is/are true?
A) HNO2 is a strong acid. B) HNO2 is a stronger acid than HCN. C) HCN is a stronger acid than HNO2. D) HNO2 and HCN are both weak acids. E) The conjugate base of HNO2 is H3O+