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 $
Show Answer
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}}, $
