Question

what else is produced during the replacement reaction of magnesium and hydrochloric acid?
mg + 2hcl → h₂ + ______
○ mgcl₂
○ mg₂cl₂
○ mg₂cl
○ mgcl

Explanation:

Step1: Identify reactant elements

Reactants: Mg (magnesium), H, Cl (from HCl). Products so far: H₂. Missing: Mg and Cl.

Step2: Determine ionic charges

Mg has charge +2; Cl has charge -1. To balance charges: 1 Mg²⁺ needs 2 Cl⁻ → MgCl₂.

Step3: Check reaction balance

Left side: 1 Mg, 2 H, 2 Cl. Right side with MgCl₂: 1 Mg, 2 H, 2 Cl. Balanced.

Answer:

A. MgCl₂