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function of SnCl2 is that it acts as a reducing agent to reduce FeCl3 to FeCl2 and function of HgCl2 is to oxidize SnCl2 to SnCl4. total iron is determined after reducing ferric iron to ferrous state.

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Q: What is the function of SnCl2 and HgCl2 in estimation of iron from plain carbon steel?
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