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Which of the following mixtures can act as a buffer?

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Which of the following mixtures can act as a buffer?
A. `NaOH + HCOONa(1:1 "molar ratio")`
B. `HCOOH + NaOH(2:1 "molar ratio")`
C. `NH_(4)Cl + NaOH(2:1 "molar ratio")`
D. `HCOOH + NaOH(1:1 "molar ratio")`
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Correct Answer - B::C
`{:("For C option",NH_(4)Cl,+,NaOH,rarr,NH_(4)OH+NaCl),("Initial",2,,1,,0),(R&F:,1,,1,,1),("Left:",1,,0,,1),("Hence basic buffer:",,,,,):}`
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