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a
NaHSO4
b
NaHCO3
c
H3PO2
d
Both (2) & (3)
answer is B.
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Detailed Solution
NaHCO3 is a salt of strong base and weak acid. It will have a basic solution.Alternatively, HCO3- ion is an amphiprotic substance. The pH of such a solution is the average of (pKa)1 and pKa2 .pH=(pKa)1+pKa22=6.77+9.332=8.05