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When manganese dioxide is heated with aluminium powder, the following reaction takes place:

These displacement reactions are highly exothermic. The amount of heat evolved is so large that the metals are produced in the molten state.

On the other hand when manganese is heated with aluminum oxide no reaction takes place as aluminum is more reactive than manganese and is placed higher in the activity series.

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Q: What is the balanced chemical equation for the chemical reaction between manganese dioxide and aluminum powder .what happens if manganese powder is heated with aluminum oxide?
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