Cu→CuO→CuSO4→Cu(OH)2→CuO осуществить цепочку превращений
1) Cu+O2→CuO+
2)CuO+H2SO4→CuSO4+
3)CuSO4+LiOH→Cu(OH)2+ SO4
4)Cu(OH)2+ →CuO
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