JAMB - Chemistry (2018 - No. 66)
Which of the following metals cannot replace hydrogen from water or steam?
Sodium
Magnesium
Iron
Copper
Explication
Metals above hydrogen in the activity series can displace or replace hydrogen present in water (H\(_2\)O) example of such metals are Ca, K, Na etc. But the metals below hydrogen in the activity series cannot replace hydrogen in the activity series example of such metals are Cu, Hg.