Write chemical reaction for each- (1) Zinc carbonate is calcinated. (2) cinnabar is heated in the air. (3) Manganese dioxide is heated with aluminum powder.
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1) zinc carbonate is heated at 400 degree Celsius and it gives zinc oxide and carbon dioxide as result.
ZnCO3=ZnO+CO2
2) 2 molecules of Mercury sulphide are heated in the presence of air and it gives it two molecules of mercuric oxide and two molecules of Sulphur dioxide.
2HgS+3O2=2HgO+3O2
3)The aluminum takes the oxygen from the manganese dioxide and reduces the manganese dioxide to metallic manganese and creates aluminum oxide plus a LOT of heat.
3MnO +2Al=3Mn+Al2O3
I hope it will help you.
ZnCO3=ZnO+CO2
2) 2 molecules of Mercury sulphide are heated in the presence of air and it gives it two molecules of mercuric oxide and two molecules of Sulphur dioxide.
2HgS+3O2=2HgO+3O2
3)The aluminum takes the oxygen from the manganese dioxide and reduces the manganese dioxide to metallic manganese and creates aluminum oxide plus a LOT of heat.
3MnO +2Al=3Mn+Al2O3
I hope it will help you.
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