The pH of 0.1 M Na2HPO4 and 0.2 M NaH2PO4 are respectively: pKa for H3PO4 are 2.2, 7.2 and 12.0.
5.6, 4.7
10, 4.7
4.7, 10
9.6, 4.7
Therefore, option(4) is correct.
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