D-And F-Block Elements Ques 72

Question: A group of acidic oxide is

[MP PET 2003]

Options:

A) $ CrO_3,Mn_2O_7 $

B) $ ZnO,Al_2O_3 $

C) $ CaO,ZnO $

D) $ Na_2O,Al_2O_3 $

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Answer:

Correct Answer: A

Solution:

$ CrO_3andMn_2O_7 $ are acidic oxide since they react with water to form acid. $ CrO_3+H_2O\to \underset{\begin{smallmatrix} Chromic \\ acid \end{smallmatrix}}{\mathop{H_2CrO_4}}, $ ; $ Mn_2O_7+H_2O\to \underset{\begin{smallmatrix} Permagnic \\ acid \end{smallmatrix}}{\mathop{2HMnO_4}}, $



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