(a) Strongest base has largest Kb: CN- Weakest base has smallest Kb: [NO2]- (b) Conjugate acid of [HS]-: H2S (c) Weakest base has strongest conjugate acid: [NO2]- Strongest base has weakest conjugate acid: CN- Solution (a) Strongest base has largest Kb: CN- Weakest base has smallest Kb: [NO2]- (b) Conjugate acid of [HS]-: H2S (c) Weakest base has strongest conjugate acid: [NO2]- Strongest base has weakest conjugate acid: CN-.