Question

One gram of a substance was oxidized. The energy released amounted to
9.0Kcal. The substance was of the type:
a) Carbohydrates
b) Fats
c) Vitamins
d) Proteins

Answer 1

Answer:

fats

carbohydrates have 4 Kcal and vitamins have

Answer 2

Answer:

b) Fats. Fats produce the maximum energy when oxidised.

Explanation:

Fats and carbohydrates are the food nutrients that give maximum energy. On oxidation, that is treating the substance with oxygen fats provide about 9 kilocalories per gram and carbohydrates provide about 4 kilocalories per gram. Proteins also provide about 4 kilocalories per gram. Vitamins do not produce any noticeable amount of energy.

When fats are oxidised carbon dioxide and water are produced and a good amount of energy is released. This energy amounts to 9 kilocalories per gram.

The chemical reaction is :

$\bold{\mathrm{O}_{2}+\mathrm{fat}=\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O}+\text { energy }(9 \mathrm{kcal} / \mathrm{g})}$