Question
Sun September 23, 2012 By:

Which Crytal of substance changed their colour on heating in closed test tube but regained it after sometime on cooling name subtance and phenomenon involved.tomm is my paper plz send fast

Expert Reply
Mon September 24, 2012
Examples are CaCl2.2H2O Calcium Chloride, [Cu(H2O)4]SO4·H2O copper sulfate
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