Question

single replacement reactions given. check to see that the equations are zn + 2hcl → ? zn + h₂ zncl + h₂ zncl₂ + h₂ zn + h₂ + cl

Explanation:

Step1: Identify reaction type

This is a single - replacement reaction. In a single - replacement reaction of a metal with an acid (HCl is an acid), the metal (Zn) will replace the hydrogen in the acid. The general form of the reaction is \(M + HX
ightarrow MX + H_{2}\), where \(M\) is the metal, \(HX\) is the acid, and \(MX\) is the salt formed.

Step2: Determine oxidation states and product formula

Zinc (Zn) has an oxidation state of 0 in its elemental form. In HCl, hydrogen (H) has an oxidation state of + 1 and chlorine (Cl) has an oxidation state of - 1. When Zn reacts with HCl, Zn will lose electrons (be oxidized) and H⁺ in HCl will gain electrons (be reduced to \(H_{2}\)). The zinc ion (\(Zn^{2 + }\)) will combine with chloride ions (\(Cl^{-}\)). Since the charge of \(Zn^{2+}\) is + 2 and the charge of \(Cl^{-}\) is - 1, to form a neutral compound, we need 2 chloride ions for each zinc ion. So the formula of the zinc - chloride compound is \(ZnCl_{2}\).

The reaction equation should be \(Zn + 2HCl
ightarrow ZnCl_{2}+H_{2}\)

Answer:

\(ZnCl_{2}+H_{2}\) (corresponding to the option " \(ZnCl_{2}+H_{2}\)")