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In the solid state reaction, which mechanism describes the reaction between MgO and Al2O3 for the formation of MgAl2O4?

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In the solid state reaction, which mechanism describes the reaction between MgO and Al2O3 for the formation of MgAl2O4?

(a) Mannich reaction

(b) Aromic ion mechanism

(c) Wagner mechanism

(d) Witting reaction

This question was addressed to me by my school teacher while I was bunking the class.

My question is taken from Solid State Reaction in section Preparative Methods of Solid State Chemistry

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Correct option is (c) Wagner mechanism

Easy explanation: The mechanism of reaction between MgO and Al2O3 involves the counter diffusion of Mg^2++ and Al^3++ through the product layer followed by further reaction at two reactant-product interfaces, and this is known as Wagner reaction.

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