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Chemisty (please read soon)

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which will become a buffer in 1L of H2O?
a) 0.3 mole KOH & 0.3 mole HBr
b) 0.5 mole NH3 & 0.5 mole HCl
c) 0.2 mole NaCl & 0.3 mole HCl
d) 0.2 mole NaOH & 0.2 mole HBr
e) 0.4 mole HC2H3O2 & 0.2 mole NaOH

I think that the answer is e. Is that correct?

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