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Question

If Ka1 and Ka2 are the ionization constants of H3+NCHRCOOH and H3+NCHRCOO, respectively, the pH of the solution at the isoelectric point is:

A
pH=pKa1+pKa2
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B
pH=(pKa1 pKa2)12
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C
pH=(pKa1+pKa2)12
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D
pH=(pKa1+pKa2)2
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