Question

Which reaction is accompanied by the release of the greatest amount of energy?

(1) combustion of 10. g of propane
(2) electrolysis of 10. g of water
(3) nuclear fission of 10. g of uranium
(4) oxidation of 10. g of iron

Answer 1

Nuclear fission releases the most energy.

Answer 2

Nuclear fission of 10.0g of uranium.

Step-by-step explanation:

The energy released in a nuclear reaction is much higher than the energy released in a chemical reaction (if equivalent amount of reactants are taken).

combustion,electrolysis and oxidation, all are chemical process.

So if ten grams of propane, water and iron are compared with the 10 gram of uranium undergoing nuclear reaction, the amount of energy will be released more in it.