Redox and Electrochemistry questions?

Update: 1) Based of the Activity series (table J of periodic table), which of the following metals could not replace any of the others? 1)Calcium 2)Sodium 3)Magnesium 4)Aluminum 2) The standard on which the activity series is based is 1)fluorine 2)lithium 3)hydrogen 4)oxygen 3)Which metal can reduce... show more 1) Based of the Activity series (table J of periodic table), which of the following metals could not replace any of the others?
1)Calcium
2)Sodium
3)Magnesium
4)Aluminum

2) The standard on which the activity series is based is
1)fluorine
2)lithium
3)hydrogen
4)oxygen

3)Which metal can reduce Pb^+2
1)Cu
2)Hg
3)Fe
4)Ag

Thank u very much ^
1 answer 1