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\[
\begin{array}{l}
\mathrm{Ag}^{+}+\mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)^{+} ;\right] \mathrm{K}_{1}=1.6 \times 10^{3} \\
{\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)^{+}\right]+\mathrm{NH}_{3} \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}{ }^{+} ;\right]} \\
\mathrm{K}_{2}=6.8 \times 10^{3}
\end{array}
\]
\( \mathrm{P} \)
W
The formation constant of \( \left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}{ }^{+}\right] \)is
(1) \( 1.08 \times 10^{7} \)
(2) \( 6.08 \times 10^{6} \)
(3) \( 1.08 \times 10^{3} \)
(4) \( 1.08 \times 10^{5} \)
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