Phosphoric acid ionizes in three steps with their ionization constant values K a 1 , K a 2 and K a 3 , respectively, while K is the overall ionization constant. Which of the following statements are true? A. K = K a 1 + K a 2 + K a 3 B. H3PO4 is a stronger acid than H2PO4 - and HPO4 2- C. K a 1 > K a 2 > K a 3 D. K a 1 = K a 3 + K a 2 2 Choose the correct answer from the options given below :

1. A. A, B and C only
2. B. A and B only
3. C. A and C only
4. D. B, C and D only

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