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JIPMER 2015
Exam
JIPMER
Year
2015
Subject
Chemistry
Chapter
Biomolecules

JIPMER 2015 · Chemistry · Biomolecules

In an amino acid, the carboxyl group ionises at p K_ a_1 =2.34 and...

In an amino acid, the carboxyl group ionises at pKa1=2.34\mathrm{p} K_{a_1}=2.34 and ammonium ion at pKa2=9.60\mathrm{p} K_{a_2}=9.60. The isoelectric point of the amino acid is at pH

Options

  1. A4.324.32
  2. B3.343.34
  3. C9.469.46
  4. D5.975.97

Correct answer

D. 5.975.97

Step-by-step solution

Isoelectric point, pH=pKa1+pK∝2\mathrm{pH}=\frac{\mathrm{p} K_{a 1}+\mathrm{p} K_{\propto}}{2} =2.34+9.602=5.97=\frac{2.34+9.60}{2}=5.97
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