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Tell which of the following statements accurately describes the effect of adding \( \mathrm{CN}^{-} \)to the cathode of a cell with a cell reaction: \( \mathrm{Cd}+2 \mathrm{Ag}^{+} \rightarrow 2 \mathrm{Ag}+ \) \( \mathrm{Cd}^{2+}, E^{\circ}=1.2 \mathrm{~V} \)
(a) \( E^{\circ} \) increases because \( \mathrm{Cd}(\mathrm{CN})_{4}{ }^{2-} \) forms
(b) \( E^{\circ} \) decreases because \( \mathrm{Cd}(\mathrm{CN})_{4}{ }^{2-} \) forms
(c) \( E^{\circ} \) increases because \( \mathrm{Ag}(\mathrm{CN})_{2}{ }^{-} \)forms
(d) \( E^{\circ} \) decreases because \( \mathrm{Ag}(\mathrm{CN})_{2}{ }^{-} \)forms
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