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1. 0000 mL of which is equivalent to 11.17 mg of iron. Express the results of the analysis as(1)w(Fe);(2)w(Fe2O3);(3)w(Fe3O4).
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A 1.5380g sample of iron ore is dissolved in acid，the iron is reduced to the +2 oxidation state quantitatively and titrated with 43.50mL of KMnO4solution(Fe2+→Fe3+),1.000 mL of which is equivalent to 11.17 mg of iron． Express the results of the analysis as (1)w(Fe)；(2)w(Fe2O3)；(3)w(Fe3O4)．
A．It directed air at melted iron in a furnace, removing all impurities.
B．It slowly heated iron ore then stirred it and heated it again.
C．It changed iron ore into iron which was a substitute for steel.
D．It could quickly find deposits of iron ore under the ground.
A．It directed air at melted iron in a furnace, removing all impurities.
B．It slowly heated iron ore, then stirred it and heated it again.
C．It changed iron ore into iron, which was a substitute for' steel.
D．It could quickly find deposits of iron ore under the ground.
A．It directed air at melted iron in a furnace, removing all impurities.
B．It could quickly find deposits of iron ore under the ground.
C．It slowly heated iron ore, then stirred it and heated it again.
D．It changed iron ore into iron, which was a substitute for steel.
According to the passage, where were large deposits of iron ore uncovered？
A．In Pittsburgh.
B．In the Mesabi Range.
C．Near lake Michigan.
D．Near Lake Erie.
A、wheat
B、electric machine
C、mineral ore
D、toys
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