A \( 30mL\ 0.1M\ NH_4OH+20mL\ 0.2M\ HCl \)
B \( 40mL\ 0.2M\ CH_3COOH+30mL\ 0.3M\ NaoH \)
C \( 50mL\ 0.1M\ NaOH+40mL\ 0.2M\ H_2CO_3 \)
D \( 60mL\ 0.1M\ NaOH+70mL\ 0.2M\ HCl \)
Correct Answer: Option C
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