A) \[Cr{{O}_{3}},\,\,M{{n}_{2}}{{O}_{7}}\]
B) \[ZnO,\,\,A{{l}_{2}}{{O}_{3}}\]
C) \[CaO,\,\,ZnO\]
D) \[N{{a}_{2}}O,\,\,A{{l}_{2}}{{O}_{3}}\]
Correct Answer: A
Solution :
\[Cr{{O}_{3}}\,\,\text{and}\,\,M{{n}_{2}}{{O}_{7}}\] are acidic oxide since they react with water to form acid. \[Cr{{O}_{3}}+{{H}_{2}}O\to \underset{\begin{smallmatrix} \text{Chromic} \\ \text{acid} \end{smallmatrix}}{\mathop{{{H}_{2}}Cr{{O}_{4}}}}\,\]; \[M{{n}_{2}}{{O}_{7}}+{{H}_{2}}O\to \underset{\begin{smallmatrix} \text{Permagnic} \\ \text{acid} \end{smallmatrix}}{\mathop{2HMn{{O}_{4}}}}\,\]
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