Question

# The ignition mixture in “alumina thermite” process consists of a mixture of:(A) Magnesium powder and $Ba{O_2}$ or $KCl{O_3}$ (B) Magnesium powder, aluminium and $Ba{O_2}/KCl{O_3}$ (C) Magnesium and aluminium powder(D) Magnesium and aluminium oxides

Hint: The alumina thermite process uses a metal powder and a metal oxide, heating them to ignition where they undergo a highly exothermic, oxidation-reduction reaction.

-The alumina thermite process will usually contain oxides of chromium and manganese which have a high melting point and so cannot be reduced by carbon. But aluminium can reduce them. The ignition mixture will contain magnesium powder along with $Ba{O_2}$ or $KCl{O_3}$. The involved reactions can be written as:
$C{r_2}{O_3} + 2Al \to A{l_2}{O_3} + 2Cr + heat(q)$
$3M{n_3}{O_4} + 8Al \to 4A{l_2}{O_3} + 9Mn + heat(q)$
So, the correct option is: (A) Magnesium powder and $Ba{O_2}$ or $KCl{O_3}$.