Oxides of elements - class-XII

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Multiple Choice

Which of the following are basic oxides? 
$Mn _2O _7$ ,$V _2O _3$, $V _2O _5$, $Cr _2O _3, CrO$ 

  1. $Mn _2O _7$ and $V _2O _3$
  2. $V _2O _3$ and $CrO$
  3. $CrO$ and $Cr _2O _3$
  4. $V _2O _5$ and $V _2O _3$
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