JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

The order of stability of metal oxides is [Manipal 2009]

(A)Al_2O_3 < MgO < Fe_2O_3 < Cr_2O_3
(B)Cr_2O_3 < MgO < Al_2O_3 < Fe_2O_3
(C)Fe_2O_3 < Cr_2O_3 < Al_2O_3 < MgOCorrect
(D)Fe_2O_3 < Al_2O_3 < Cr_2O_3 < MgO

Answer: (C)

Solution

Thermal stability of an ionic oxide broadly tracks the electropositive character of the metal: Mg²⁺ (an alkaline-earth ion) forms the most stable oxide, followed by Al³⁺, with the transition-metal oxides and

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Question ID VK-133113