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Which of the following not a normal oxide ? 

Option: 1

MgO


Option: 2

Al_2O_3


Option: 3

Mn_2O_7


Option: 4

CrO_5


Answers (1)

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As we have learned

Normal oxides -

These contain oxygen atoms according to the normal oxidation number 

MgO, H2O, CaO, Li2O.

 

MgO, Al_2O_3  and Mn_2O_7 contain oxygen atoms according to the normal oxidation number  but CrO_5  have the periodic bond.

Image result for CrO5 stru

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