$A$ space rocket is propelled by

What is the reason for adding glycerol to aviation fuel?

Which of the following is not used in rocket propellants?

Solid fuel used in rockets is a mixture of $Fe_2O_3$ and $Al$ (in ratio $1:2$ by moles). The heat evolved $(kJ)$ per gram of the mixture is $............$. (Nearest integer)
Given: $\Delta H_{f}^{\ominus}(Al_2O_3) = -1700 \ kJ \ mol^{-1}$
$\Delta H_{f}^{\ominus}(Fe_2O_3) = -840 \ kJ \ mol^{-1}$
Molar mass of $Fe$,$Al$ and $O$ are $56$,$27$ and $16 \ g \ mol^{-1}$ respectively.

What is the reason for adding glycerol to aviation fuel?

Which of the following acts as a rocket propellant?