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Which of the following solutions could be classified as a buffer? a) 0.100 M HBR and 0.100 M KBr b) 0.100 M HCl and 0.100 M NaOH c) 0.100 M HCl and 0.100 M NH4Cl d) 0.100 M HNO2 and 0.100 M NaNO2