1. Окраска лакмуса различна в каждом из растворов солей в группе:
1) KCl, LiNO3, FeSO4
2) NH4NO3, Li2SO4, MgSO4
3) Ba(NO3)2, CH3COONa, ZnCl2
4) Na2CO3, ZnCl2, K3PO4

И почему?!
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