Problem- Using your understanding of conjugate acids and bases pick the correct statement from the multiple choices
1) H2NNH2 is the conjugate acid of HNNH^2-
2) H2NNH2 is the conjugate base of H3NNH3^2+
3) H2C6H4O2 is the conjugate base of HC6H4O2^-
4) OH^- is the conjugate base of OH^-
5) H2BO3^- is the conjugate acid of HBO3^2-
Please illustrate work if possible thanks