MCQ
A group of acidic oxide is
  • $Cr{O_3},\,\,M{n_2}{O_7}$
  • B
    $ZnO,\,\,A{l_2}{O_3}$
  • C
    $CaO,\,\,ZnO$
  • D
    $N{a_2}O,\,\,A{l_2}{O_3}$

Answer

Correct option: A.
$Cr{O_3},\,\,M{n_2}{O_7}$
a
(a)$Cr{O_3}\,\,{\rm{and}}\,\,M{n_2}{O_7}$ 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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