Между водными растворами каких веществ возможны реакции ионного обмена?


1) KCl и Na2SO4
2) Ca(OH)2 и K2SO4
3) BaCl2 и H2SO4
4) Na2CO3 и H2SO4
5) CuCl2 и Na2SO4
6) NaOH и CuSO4
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