Which can act as buffer? – McqOptions

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1.	Which can act as buffer?
A.	NH₄Cl + HCl
B.	CH₃COOH + H₂CO₃
C.	40ml of 0.1M NaCN + 20ml of 0.1M HCN
D.	NaCl + NaOH
Answer» D. NaCl + NaOH

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