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Out of the following how many oxides are...

Out of the following how many oxides are basic: ` TiO,Sc_2 O_3,Ti_2O_3, , VO , V_2 O_5 , CrO_3 , Cr_2 O_3 , CuO,TiO_2`

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The correct Answer is:
4
`i.TiO,Sc_2 O_3 , TiO_3, VO " (Basic)"`
`ii. V_2 O_5,CrO_3 " (Acidic)"`
`iii. Cr_2O_3 , CuO,TiO_2" (Amphoteric)"`
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