The first and second dissociation constants of an acid \( \mathrm{H}_{2} \mathrm{~A} \) are \( 1...

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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
(a) \( 0.2 \times 10^{5} \)
(b) \( 5.0 \times 10^{-5} \)
(c) \( 5.0 \times 10^{15} \)
(d) \( 5.0 \times 10^{-15} \).
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