(a) Crystals of a substance changed their colour on heating in a closed test tubebut regained it aftersometime when they were allowed to cool down. Name the
substance and write its formula and explain the phenomenon involved.
(b) Name the compound whose one formula unit is associated with 10 watermolecules. How is it prepared? Give equations of related reactions. Give two uses of the compound.
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Answer:
The substance is , the crystal salt of copper sulphate having the formula CUSO4. 5H2O . This 5H2O , that is the water of crystallization makes the colour of the salt appear BLUE. But once its heated the water evaporates and the salt transforms into WHITE.
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abbe pgl khi na gyi mai xD hddi khika
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