Какие ионы могут одновременно существовать в водных растворах?
 
1.Ba(2+), NO3(-1), SO4(-2), NH4(+1), Br(1-). 
2.Zn(+2), Cl(-1), Fe(+2), Ca(+2), OH(-1).
3.Cu(+2), Br(-1), S(-2), Ag(1+), NO3(-1).
4.Fe(+2), SO4(-2), Na(+1), NH4(+1), NO3(-1).
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