Olympiad workbook
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- Olympiad workbook
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- NSEC
- Chapter
- Coordination Compounds
Olympiad workbook · NSEC · Coordination Compounds
Crystalline iron(III) nitrate nonahydrate, Fe(NO_3)_3 · 9 H_2 O ,...
Crystalline iron(III) nitrate nonahydrate, , has a very pale violet colour. When added to water, the crystals dissolve to form a brown solution. Treatment of this brown solution with concentrated nitric acid yields a very pale violet solution while treatment with HCl yields a yellow solution.
Identify the correct statements regarding the above observations.
Options
- AThe brown colour is due to \left[\mathrm{Fe}(\mathrm{OH})\left(\mathrm{H}_2 \mathrm{O}\right)_5\right]^{2+},\left[\mathrm{Fe}(\mathrm{OH})_2\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{+}
- BViolet colour is due to
- CAddition of shifts the equilibrium \left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons\left[\mathrm{Fe}(\mathrm{OH})\left(\mathrm{H}_2 \mathrm{O}\right)_5\right]^{2+}+\mathrm{H}_3 \mathrm{O}^{+}
- DAddition of shifts the equilibrium \left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons\left[\mathrm{Fe}(\mathrm{OH})\left(\mathrm{H}_2 \mathrm{O}\right)_5\right]^{2+}+\mathrm{H}_3 \mathrm{O}^{+}
Correct answer
C. Addition of shifts the equilibrium \left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons\left[\mathrm{Fe}(\mathrm{OH})\left(\mathrm{H}_2 \mathrm{O}\right)_5\right]^{2+}+\mathrm{H}_3 \mathrm{O}^{+}
Step-by-step solution
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