Complete the following Acid-Base reactions and identify each reactant as an Acid or a Base:
$(i)$ $CH_3NH_2 + H_2O$
$(ii)$ $CO_2 + H_2O$
$(iii)$ $H_2PO_4^- + CO_3^{2-}$
$(iv)$ $NH_2NH_2 + H_2O$
$(v)$ $C_6H_6 + NO_2^+$
$(vi)$ $C_6H_6 + NH_2^-$

(N/A) $(i)$ $CH_3NH_2$ (Base) $+ H_2O$ (Acid) $\rightleftharpoons$ $CH_3NH_3^+ + OH^-$
$(ii)$ $CO_2$ (Acid) $+ H_2O$ (Base) $\rightleftharpoons$ $H_2CO_3$
$(iii)$ $H_2PO_4^-$ (Acid) $+ CO_3^{2-}$ (Base) $\rightleftharpoons$ $HPO_4^{2-} + HCO_3^-$
$(iv)$ $NH_2NH_2$ (Base) $+ H_2O$ (Acid) $\rightleftharpoons$ $NH_2NH_3^+ + OH^-$
$(v)$ $C_6H_6$ (Base) $+ NO_2^+$ (Acid) $\rightleftharpoons$ $C_6H_5NO_2 + H^+$
$(vi)$ $C_6H_6$ (Acid) $+ NH_2^-$ (Base) $\rightleftharpoons$ $C_6H_5^- + NH_3$