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The first and second dissociation constants of an acid \( \mathrm{H}_{2} \mathrm{~A} \) are \( 1.0 \times 10^{-5} \) and \( 5.0 \times 10^{-10} \) respectively. The overall dissociation constant of the acid will be :
(1) \( 5.0 \times 10^{-15} \)
(2) \( 0.2 \times 10^{5} \)
(3) \( 5.0 \times 10^{-5} \)
(4) \( 5.0 \times 10^{15} \)
\( \mathrm{P} \)
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