Answers: 2
which contains 
as a metal and 
as a non metal. Thus the ratio of metal to non metal ions is 1:1.
which contains 
as a non metal. Thus the ratio of metal to non metal ions is 1:1.
which contains 
as a non metal. Thus the ratio of metal to non metal ions is 1:2.
which contains 
as a non metal. Thus the ratio of metal to non metal ions is 3:2.
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