В следующем ряду оксидов Cr2O3, Al2O3, ВеO, Na2O амфотерными свойствами не обладает: а) Cr2O3 б) Al2O3 в) ВеO г) Na2O

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1) Cu + 2H2SO4(конц.) => CuSO4 + SO2 + 2H2O  

Cu(0) + 4H(+) + 2SO4(2-) => Cu(2+) + SO4(2-) + SO2 + 2H2O - полное ионное  

Cu(0) + 4H(+) + SO4(2-) => Cu(2+) + SO2 + 2H2O - сокращенное ионное

2) Молекулярное уравнение реакции имеет вид:

   2Cu + 2H2SO4 = CuSO4 + SO2 + 2H2O.

Уравнение в ионном виде: 2Cu^0 + 2H^+ + SO4^2- = Cu^2+ + SO4^2- + SO2 + 2H2O

3) CuO + H2SO4 = CuSO4 +H2O  

CuO + 2H+ + SO4(2-) = Cu(2+) + SO4(2-) + H2O полное ионное уравнение  

CuO + 2H+ = Cu(2+) + H2O сокращенное ионное уравнение  

4) AgNO3 + HCl = AgCl↓ + HNO3

Ag+ + NO3- + H+ + Cl- = AgCl↓ + H+ + NO3-

Ag+ + Cl- = AgCl↓

Объяснение: