Which chemical reaction involves the production of a gas?
Chemical Reactions and Gas Production
Chemical equation: A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.
In reaction Zn + 2HCl → ZnCl2 + H2, an element present in the solution is displaced by another reactive element. In this case, Zinc is displacing Hydrogen from HCl. Thus, this is an example of a displacement reaction where hydrogen gas is released.
Option B: Zn(s) + 2HCl(aq) → H2(g) + ZnCl2(aq) involves the production of gas.
Therefore, option B is correct.
What is a chemical equation?
A chemical equation is a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.