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a is displacement reaction and how's that
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in first reaction the blue colour copper solution changes to white powder because it losses water molecules and forms anhydrous copper sulphate
CuSO4 . 5H2O= CuSO4+5H2O
blue colour. white colour
Second reaction white precipitate of barium sulfate is formed.
BaCl2+NaSO4=BaSO4 + NaCl
white
ppt
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