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If you keep an iron piece in solid state...

If you keep an iron piece in solid state `CuSO_(4)` crystals, does it get any reaction? Guess the reason.

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Reaction will not takes place if an iron piece is placed in solid state `CuSO_(4)` crystals because there will not exist separate `Cu^(+2),SO_(4)^(-2)` ions in `CuSO_(4)` Crystals. In aqueous solution they exists. So iron can not displace copper.
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