Classify an oxide as acidic, basic, amphoteric or neutral

1. A.
   $\text{SO}_3$
2. B.
   $\text{NO}$
3. C.
   $\text{Al}_2\text{O}_3$
4. D.
   $\text{CaO}$

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1. A.
   CO
2. B.
   NO
3. C.
   $N_{2}O$
4. D.
   $N_{2}O_{5}$

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1. A.
   BaO
2. B.
   $\mathrm{N_2O_5}$
3. C.
   $\mathrm{CO_2}$
4. D.
   $\mathrm{Al_2O_3}$

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1. A.
   The oxide that forms acid when combined with water, is acidic oxide.
2. B.
   The oxides showing acidic as well as basic characteristics are amphoteric oxides.
3. C.
   The acidic character of oxides increases, whereas basic character decreases in a period from left to right in the periodic table.
4. D.
   $\mathrm{NO}$, $\mathrm{N_2O}$ and $\mathrm{CO}$ are amphoteric oxides.

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