JEE MAIN - Chemistry (2002 - No. 2)
For the reactions
2C + O2 $$\to$$ 2CO2; $$\Delta H$$ = -393 J
2Zn + O2 $$\to$$ 2ZnO; $$\Delta H$$ = -412 J
2C + O2 $$\to$$ 2CO2; $$\Delta H$$ = -393 J
2Zn + O2 $$\to$$ 2ZnO; $$\Delta H$$ = -412 J
carbon can oxidise Zn
oxidation of carbon is not feasible
oxidation of Zn is not feasible
Zn can oxidise carbon
Paaiškinimas
$$\Delta H$$ negative shows that the reaction is spontaneous. Higher negative value for $$Zn$$ shows that the reaction is more feasible.