write the chemical equation of each of the reaction in which the following changes have taken place with the help of example of each (1) change in colour (2) change in temperature (3) formation of precipitate?
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1) Change in color
CuSO4+Fe=FeSo4+Cu
Blue light green
2) Zn+H2So4=ZnSo4+H2 +Heat evolved
3) NaSo4+BaCl=BaSo4+NaCL
white ppt
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