Question

Name two metals which will displace hydrogen from dilute acids, and two metals which will not.

NCERT Class X
Science - Science

Chapter_Metals and Non Metals

Answer 1

Metals that are more reactive than hydrogen displace it from dilute acids.

for eg-Iron 

Metals that are less reactive than hydrogen do not displace it.
for eg- copper

Answer 2

will- Iron and aluminium
will not- Mercury and copper