Which of the following is incorrect?

Options

A. Calorific value of fat is more than that of carbohydrate and protein.
B. `Delta_(C ) H^(@)` is always negative
C. Calforific value of kerosene is less than that of coal.
D. Butane is the main component of cooking gas.

Answer

C

Explanation

Fluid fossil fuels such as kerosene are popular because they release more heat per gram tha coal does. Kerosene is apporximately `C_(12) H_(26)`, the thermochemical equation is
`C_(12) H_(26) (1) (37)/(2) O_(2) (g) rarr 12 CO_(2) (g) + 13 H_(2) O (g)`
`Delta_(C ) H^(@) = - 7513 kJ`
The average calorific value quoted for carbohydrates and fats are `4.0 cal g^(-1)` and `9.0 kcal g^(-1)`, respectively. Note that fats contain more than twice the fuel value per gram as do carbhydrates. Thus, by storing its fuel s fat, the body can store more fuel for a given mass of body tissue.