In the following observation.AcidKa1Ka2(X)Oxalic acid5.9×10-26.4×10-5 Ascorbic acid7.4×10-41.6×10-12 Sulphurous acid1.7×10-26.4×10-8 (Y)Very large1.2×10-2 Carbonic acid4.3×10-7(Z) Citric acid7.4×10-41.7×10-54.0×10-7Phosphoric acid7.5×10-36.2×10-84.2×10-13X,Y and Z respectively are

The X ,Y and Z are Ka3, sulphuric acid and 5.6×10-11, respectively.

In the following observation.AcidKa1Ka2(X)Oxalic acid5.9×10-26.4×10-5 Ascorbic acid7.4×10-41.6×10-12 Sulphurous acid1.7×10-26.4×10-8 (Y)Very large1.2×10-2 Carbonic acid4.3×10-7(Z) Citric acid7.4×10-41.7×10-54.0×10-7Phosphoric acid7.5×10-36.2×10-84.2×10-13X,Y and Z respectively are

The X ,Y and Z are Ka3, sulphuric acid and 5.6×10-11, respectively.

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In the following observation.
Acid $K_{a_{1}}$ $K_{a_{2}}$ (X)
Oxalic acid $5.9 \times 10^{- 2}$ $6.4 \times 10^{- 5}$
Ascorbic acid $7.4 \times 10^{- 4}$ $1.6 \times 10^{- 12}$
Sulphurous acid $1.7 \times 10^{- 2}$ $6.4 \times 10^{- 8}$
(Y) Very large $1.2 \times 10^{- 2}$
Carbonic acid $4.3 \times 10^{- 7}$ (Z)
Citric acid $7.4 \times 10^{- 4}$ $1.7 \times 10^{- 5}$ $4.0 \times 10^{- 7}$
Phosphoric acid $7.5 \times 10^{- 3}$ $6.2 \times 10^{- 8}$ $4.2 \times 10^{- 13}$
X,Y and Z respectively are

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$K_{a_{3}}, phosphorous acid, 6.5 \times 10^{- 11}$

$K_{a_{3}}, sulphuric acid, 5.6 \times 10^{- 11}$

$K = K_{a_{1}} \times K_{a_{2}}, phosphorous acid, 6.5 \times 10^{- 11}$

$K = K_{a_{1}} \times K_{a_{2}}, sulphuric acid, 5.6 \times 10^{- 11}$

answer is D.

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The X ,Y and Z are $K_{a_{3}}$ , sulphuric acid and $5.6 \times 10^{- 11}$ , respectively.

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Acid	$K_{a_{1}}$	$K_{a_{2}}$	(X)
Oxalic acid	$5.9 \times 10^{- 2}$	$6.4 \times 10^{- 5}$
Ascorbic acid	$7.4 \times 10^{- 4}$	$1.6 \times 10^{- 12}$
Sulphurous acid	$1.7 \times 10^{- 2}$	$6.4 \times 10^{- 8}$
(Y)	Very large	$1.2 \times 10^{- 2}$
Carbonic acid	$4.3 \times 10^{- 7}$	(Z)
Citric acid	$7.4 \times 10^{- 4}$	$1.7 \times 10^{- 5}$	$4.0 \times 10^{- 7}$
Phosphoric acid	$7.5 \times 10^{- 3}$	$6.2 \times 10^{- 8}$	$4.2 \times 10^{- 13}$

In the following observation.AcidKa1Ka2(X)Oxalic acid5.9×10-26.4×10-5 Ascorbic acid7.4×10-41.6×10-12 Sulphurous acid1.7×10-26.4×10-8 (Y)Very large1.2×10-2 Carbonic acid4.3×10-7(Z) Citric acid7.4×10-41.7×10-54.0×10-7Phosphoric acid7.5×10-36.2×10-84.2×10-13X,Y and Z respectively are

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