Which of the following do not form conjugate acid - base pair in the right order :-

Which of the following do not form conjugate acid - base pair in the right order :-
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Which of the following do not form conjugate acid - base pair in the right order :- A. `NH_(3),NH_(2)` B. `OH^(- ... 3),CO_(3)^(2)` D. `H_(2)S,HS^(-)`
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