Question

why is hydrogen placed in reactivity series ​

Answer 1

Answer:

For example, zinc is above hydrogen so it can't be displaced because it is more reactive. Hydrogen is included in the reactivity series of metals because it's property of electroposivity (i.e losing electron to form positive ion) is similar to that of metals, thats why we can relate it with metals

Answer 2

Answer:

for example , zinc is

above hydrogen so it can be displaced because it is more reactive . Hydrogen is included in the reactivity series of metal because it's property is electroposivity is similar to that of metal

that why we can relate it with metal.