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Q.

At 298 K, the values of $K_{a_{1}}$ and $K_{a_{3}}$ of $H_{3} P O_{4}$ are $7.5 \times 10^{- 3}$ and $4.2 \times 10^{- 13}$ respectively. Its $K_{a_{2}}$ value would be

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a

$0.36 \times 10^{- 1}$

b

$2.7 \times 10^{- 14}$

c

$1.8 \times 10^{- 2}$

d

$6.3 \times 10^{- 8}$

answer is D.

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Detailed Solution

For a poly basic acid, $K_{a_{1}} > K_{a_{2}} > K_{a_{3}} .......$

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