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ferric iodide is very unstable but ferric chloride is stable.why?

ferric iodide is very unstable but ferric chloride is stable.why?

Grade:11

3 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
7 years ago
ferric iodide is very unstable but ferric chloride is stable:-
I- is a stronger reducing agent in comparison to Cl-Fe+3 is easily reduced by iodide ion.Therefore it gets reduced to iodine.The standard electrode potential of chlorine is much higher,it means it is a better oxiding agent.Also the large size of iodine makes it a strong reducing agent
FeI3 ------->FeI +I2
Sapna Jha
24 Points
5 years ago
FeI3 is unstable because Fe^+3 is strong oxidising agent but I^- has very less reducing power. (chemistryclass.org)
Parag Dasgupta
34 Points
4 years ago
I- ion is stronger reducing agent than Cl- ion.Hence Fe3+ ion is easily reduced by I- ion to Fe2+ ion & itself gets oxidized to I2.But this doesn`t happen in case of FeCl3.Hence FeCl3 is stable but FeI3 is unstable.2Fe3+ +2I- ->2Fe2+ +I2.

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