A) 3 part metal oxide +1 part Al is taken as thermite mixture
B) Ignition mixture (Mg powder + \[Ba{{O}_{2}}\]) acts as catalyst
C) Metals (Fe, Cr) are obtained in vapour form
D) Reaction is exothermic due to highly +ve enthalpy of formation of \[A{{l}_{2}}{{O}_{3}}\].
Correct Answer: A
Solution :
\[\text{(Mg}\,\text{powder+BA}{{\text{O}}_{\text{2}}}\text{)}\]acts as ignition mixture Fe, Cr are obtained in molten state Enthalpy of formation of \[A{{l}_{2}}{{O}_{3}}\]is negative.
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