Question

why hydrogen is placed in reactivity series of metal

Answer 1

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

Hydrogen is a non metal but it has been placed in the reactivity series of metal because it can behave as an electropositive element (i.e losing electron to form positive ion) like metals and resembles metals in some of its characteristics.

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REGARDS..❤️