Copper and silver
Lead and zinc
Copper and lead
Above in activity series
Sodium and copper
Aluminium and sodium
Lead and copper
Lead
Copper
Zinc
Iron
Sodium
Calcium
Aluminum
Lead
Copper
Gold
Lead
Aluminium
Lead
Potassium
Sodium
Calcium
Magnesium
Potassium
Sodium
Lead and calcium
Aluminium and copper
Lead and zinc
Sodium and potassium
Lead and aluminium
Magnesium and calcium
Sodium
Potassium
Silver
Both 1 and 2
Sodium and calcium
Copper and silver
Sodium and potassium
Only sodium
Silver and mercury
Sodium and potassium
Silver and sodium
Potassium and silver
Copper and silver nitrate
Silver and copper nitrate
Gold
Platinum
Silver
All of above
Aluminium
Lead
Zinc
Iron