$H_2O_2$ used in rockets has the concentration $............. \%$

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 fuels are used in thermal plants and fuel cell?

The propellant in the proposed $PSLV$ rocket of the Indian space programme shall consist of

Which of the following represents a biliquid propellant?

The thrust imparted to the rocket is governed by which of the following?