| Direction (Q. Nos. 59): For the following questions choose the correct answers from the codes a, b, c and d defined as follows. |
| Statement I The dissociation constants of a polyprotic acid are in the order \[{{K}_{1}}>{{K}_{2}}>{{K}_{3}}\]. |
| Statement II The \[[{{H}^{+}}]\] furnished in first step of dissociation exerts common ion effect to reduce the second dissociation and so on. |
A) Statement I is true. Statement II is also true and Statement II is the correct explanation of Statement I.
B) Statement I is true. Statement II is also true and Statement II is not the correct explanation of Statement I.
C) Statement I is true. Statement II is false.
D) Statement I is false. Statement II is true.
Correct Answer: A
Solution :
Statement (II) is the correct explanation of (I) \[e.g.\,\underset{Acid}{\mathop{{{H}_{3}}A\,}}\,\,\,\underset{\begin{smallmatrix} \text{Conjugate}\, \\ \,\,\,\,\,\,\,\text{base} \\ \text{(weak}\,\text{acid)} \end{smallmatrix}}{\mathop{\,{{H}_{2}}{{A}^{\odot -}}}}\,\,+\,\,{{H}^{\oplus }}\] \[\underset{Acid}{\mathop{{{H}_{2}}{{A}^{\odot -}}\,}}\,\,\,\underset{\begin{smallmatrix} \text{Conjugate}\, \\ \,\,\,\,\,\,\,\text{base} \\ \text{(weak}\,\text{acid)} \end{smallmatrix}}{\mathop{\,H{{A}^{2-}}}}\,\,+\,\,{{H}^{\oplus }}\]
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