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Which from the given reactions is used for laboratory preparation of hydrogen?

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Which from the given reactions is used for laboratory preparation of hydrogen? 

А.  Fe + H2O → Fe3O4 + H2 

B.  CH4 + 2H2O → CO2 + 4H2

C.  Zn + 2HCl → ZnCl2 + H2

D.  CH4 → C + 2H2 

E.  C + H2O → CO + H2 

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C.  Zn + 2HCl → ZnCl2 + H2 

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