Question

My answer is shown in the boxes but they're wrong!! I don't know what I did wrong! Please help and show me how to get the right answers.

Answer 1

The balanced molecular equation is : Mg(s)+ 2HBr(aq) ----> MgBr₂(aq) + H₂(g)

Total ionic equation is : Mg(s)+ 2H⁺(aq) + 2Br^-(aq) ----> Mg²⁺(aq) + 2Br^-(aq) + H₂(g)

Spectator ion is Br^-

Cancelling the spectator ions we get the net ionic equation

0          +1                 +2           0

Mg(s)+ 2H⁺(aq) ----> Mg²⁺(aq) + H₂(g)

Here the oxidation state of Mg increases from 0 to +2 it is oxidation reaction.

Also the oxidation state of H decreases from +1 to 0 so it is the reduction reaction

Since both oxidation & reduction reactions takes place so it is an example of reduction-oxidation reaction.