The ignition mixture in "alumino thermite" process consists of a mixture of:

magnesium powder and

B a O_{2}

K C l O_{3}

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magnesium powder, aluminium and

B a O_{2} / K C l O_{3}

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magnesium and aluminium powder

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magnesium and aluminium oxides

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Solution

The correct option is A magnesium powder and $B a O_{2}$ or $K C l O_{3}$
Alumino thermite process, contain oxides of $M n,$ $C r,$ that is not reduced by carbon due to very high melting point. They are reduced by $A l$ . Its mixture consists of $M g$ powder along with $B a O_{2}$ or $K C l O_{3}$ .

$C r_{2} O_{3} + 2 A l \to A l_{2} O_{3} + 2 C r + h e a t$

$3 M n_{3} O_{4} + 8 A l \to 4 A l_{2} O_{3} + 9 M n + h e a t$

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(a) What is thermit?

(b) What is ignition mixture?

F e_{2} O_{3}

[I I I]

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