in the reaction mg + 2hcl → mgcl₂ + h₂ which elements oxidation number does not change?\no cl\no mg\no h\ndone
in the reaction mg + 2hcl → mgcl₂ + h₂ which elements oxidation number does not change?\no cl\no mg\no h\ndone
Answer
Explanation:
Step1: Determine oxidation numbers in reactants
In $Mg$, oxidation number of $Mg$ is $0$ (element in free - state). In $HCl$, hydrogen has an oxidation number of $+ 1$ and chlorine has an oxidation number of $-1$.
Step2: Determine oxidation numbers in products
In $MgCl_2$, magnesium has an oxidation number of $+2$ and chlorine has an oxidation number of $-1$. In $H_2$, hydrogen has an oxidation number of $0$ (element in free - state).
Step3: Analyze the change
The oxidation number of $Mg$ changes from $0$ to $+2$. The oxidation number of $H$ changes from $+1$ to $0$. The oxidation number of $Cl$ remains $-1$ in $HCl$ and $MgCl_2$.
Answer:
A. Cl