Which oxide is amphoteric

1. A.
   I and II
2. B.
   II and III
3. C.
   III and IV
4. D.
   I and IV

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1. A.
   $\mathrm{CuO}$
2. B.
   $\mathrm{Al_2O_3}$
3. C.
   $\mathrm{Na_2O}$
4. D.
   $\mathrm{K_2O}$

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1. A.
   acidic
2. B.
   basic
3. C.
   amphoteric
4. D.
   neutral

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1. A.
   $\mathrm{Na_2O}$
2. B.
   $\mathrm{K_2O}$
3. C.
   $\mathrm{CO_2}$
4. D.
   $\mathrm{Al_2O_3}$

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