Ответ:
1) 3H2SO4+2Cr=Cr2(SO4)3+3H2↑
2) H2SO4+2KCl=2HCl+K2SO4
3) H2SO4+2KOH=K2SO4+2H2O
4) H2SO4+Cu=CuSO4+H2↑
5) Cr2O3+3H2SO4=Cr2(SO4)3+3H2O
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Ответ:
1) 3H2SO4+2Cr=Cr2(SO4)3+3H2↑
2) H2SO4+2KCl=2HCl+K2SO4
3) H2SO4+2KOH=K2SO4+2H2O
4) H2SO4+Cu=CuSO4+H2↑
5) Cr2O3+3H2SO4=Cr2(SO4)3+3H2O