Among the following oxides of 3 d elements, the number of mixed oxides are $____$ 。
$Ti_{2} O_{3}, V_{2} O_{4}, Cr_{2} O_{3}, Mn_{3} O_{4}, Fe_{3} O_{4}, Fe_{2} O_{3}, Co_{3} O_{4}$

Question

Among the following oxides of 3 d elements, the number of mixed oxides are \_ \_ \_ \_。 Ti_2O_3 , V_2O_4 , Cr_2O_3 , Mn_3O_4 , Fe_3O_4 , Fe_2O_3 , Co_3O_4

Accepted Answer

Correct answer: 3. (3) Mixed oxides contain the same element in two different oxidation states. Analyzing each oxide: Ti_2O_3 contains Ti (+3 ) only - simple oxide. V_2O_4 contains V (+4 ) only - simple oxide. Cr_2O_3 contains Cr (+3 ) only - simple oxide. Mn_3O_4 can be written as MnO Mn_2O_3, containing both Mn (+2 ) and Mn (+3 ) - mixed oxide. Fe_3O_4 can be written as FeO Fe_2O_3, containing both Fe (+2 ) and Fe (+3 ) - mixed oxide. Fe_2O_3 contains Fe (+3 ) only - simple oxide. Co_3O_4 can be written as CoO Co_2O_3, containing both Co (+2 ) and Co (+3 ) - mixed oxide. Therefore, three mixed oxides are present: Mn_3O_4 , Fe_3O_4, and Co_3O_4.

$Among the following oxides of 3 d elements, the number of mixed oxides are____。 Ti_{2} O_{3}, V_{2} O_{4}, Cr_{2} O_{3}, Mn_{3} O_{4}, Fe_{3} O_{4}, Fe_{2} O_{3}, Co_{3} O_{4}$

Solution

More d- and f-Block Elements PYQs