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Q.

For the ionization of ortho phosphoric acid
$\large {H_3}P{O_4}\, \rightleftharpoons \,{H_2}P{O_4}^ - \, + \,{H^ + }({K_1})$
${H_2}P{O_{4}^{-}}\, \rightleftharpoons \,HP{O_{4}^{-2}}\, + \,{H^ + }({K_2})$
$\large HP{O_{4}^{-2}}\, \rightleftharpoons \,P{O_{4}^{-3}}\, + \,{H^ + }({K_3})$
, $K_{1}, K_{2}, K_{3}$ are successive ionization constants of the acid. Correct relation is

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a

K₁ > K₂ > K₃

b

K₁ < K₂ < K₃

c

K₁< K₂ > K₃

d

K₁.K₂.K₃ = K_w

answer is A.

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Detailed Solution

$\large {H_3}P{O_4}\, \rightleftharpoons \,{H_2}P{O_4}^ - \, + \,{H^ + }$ $\large {K_{{a_1}}}$ $\large ={7}\times 10^{-3}$

$\large {K_{{a_2}}}$ $\large ={6}\times 10^{-8}$

$\large {K_{{a_3}}}$ $\large ={5}\times 10^{-13}$

For a polyprotic acid the successive dissociation constants decreases.

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For the ionization of ortho phosphoric acid, K1, K2 , K3 are successive ionization constants of the acid. Correct relation is