1.

Correct order of increasing activity is

Answer»

CU,MG,Na
Na,Mg,Cu
Mg,Na,Cu
Cu,Na,Mg

Solution :`Cu^(+2)+ 2e^(-) to Cu, E^(@)=+0.34 V`
`Mg^(+2) +2e^(-)to Mg, E^(@)=-2.37 V`
`Na^(+) +e^(-)to Na, E^(@)=-2.71 V`


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