Question
Name two complexes which are used in medicines.
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$\text{2 Cr(s)}+3\text{ Cd}^{2+}\text{(aq.)}\rightarrow2\text{Cr}^{3+}\text{(aq.)}+3\text{ Cd(s)}$
Also calculate the $\Delta_{\text{r}}\text{G}^{\ominus}$ value of the reaction. $(\text{Given: }\text{E}^{\ominus}_{\text{ }\text{ }\text{ }\text{ Cr}^{3+/}/\text{Cr}}=+0.74\text{V};\text{E}^{\ominus}_{\text{ }\text{ }\text{ }\text{ }\text{Cd}^{2+}\text{/Cd}}=-0.40\text{V and F = 96500 C mol}^{-1})$.| Experiment | Time/s–1 | Total pressure/atm |
| 1 | 0 | 0.4 |
| 2 | 100 | 0.7 |
$\log{k}=14.2-\frac{\text{1.0}\times\text{10}^{4}}{\text{T}}K$
Calculate Ea for this reaction and rate constant k if its half-life period be 200 minutes.
(Given: R = 8.314 J K–1 mol–1)