For the reactions, C + O_2 CO_2; H = -393 J 2Zn + O_2 2ZnO; H = -412 J

JEE Main 2002 Chemistry question

For the reactions, ; J ; J

(1)carbon can oxidise Zn
(2)oxidation of carbon is not feasible
(3)oxidation of Zn is not feasible
(4)Zn can oxidise carbonCorrect

Answer: (4)

Solution

Per mole of , zinc releases more energy (412) on combining with oxygen than carbon does (393), so zinc has the greater affinity for oxygen. Combining the equations: , (exothermic), whereas has . So zinc can take

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Question ID VK-037934