Chapter 4, Problem 4.163QP

Interpretation Introduction

Interpretation: Names and positions of two metals that can displace hydrogen from (a) cold water, (b) steam, and (c) acid has to be given. Also the names of two metals that can react neither with water nor acid has to be given.

Concept Introduction:

Displacement reaction: It is a type of reaction where an ion or an atom of a compound gets replace by a chemical species of a different element.

Hydrogen atom is replaced by another element in a hydrogen displacement reaction.

All the elements in the alkali metals and few alkaline earth metals are very reactive and are able to replace hydrogen from water molecule. Hydrogen can be displaced from acid by many metals like $Zn$ and $Cd$