Which of these is not used as a fuel 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.

Which of the following is not used in rocket propellants?

Which of the following is used in the acid treatment of stainless steel and as a rocket propellant?

Match List-$I$ with List-$II$ and select the correct answer using the codes given below the lists.

List-$I$ (Compounds)	List-$II$ (Used in)
$A$. $BaSO_4 + ZnS$	$1$. Explosive
$B$. $NI_3$	$2$. Oxidiser in rocket propellants
$C$. $N_2O_4$	$3$. Space capsule
$D$. $KO_2$	$4$. Pigment

$A$ hybrid rocket propellant uses: