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Which of the following is arranged in th...

Which of the following is arranged in the order of increseing ionization constants of `H_(3)PO_(4)` ?

A

`K_(3) lt K_(1) lt K_(2)`

B

`K_(1) lt K_(2) lt K_(3)`

C

`K_(2) lt K_(1) lt K_(3)`

D

`K_(3) lt K_(2) lt K_(1)`

Text Solution

Verified by Experts

The correct Answer is:
D
Higher order ionization constants `(K_(2),K_(3))` are smaller than the lower order ionization constant `(K_(1))` of a polyprotic acid. It is more difficult to remove a positively charged proton form a negative ion `(H_(2)PO_(4)^(-),HPO_(4)^(2-))` due to electrostatic attraction.
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