Question

Consider the following chemical reaction. Mg(s)+Ni(NO3)2(aq)⟶Ni(s)+Mg(NO3)2(aq)

Which statement is true for the reaction?

The nickel(II) ion is oxidized.

The nitrate ion is the reducing agent.

The nickel(II) ion is the oxidizing agent.

Metallic magnesium is reduced.

Answer 1

Answer:

The nickel(II) ion is the oxidizing agent .

Explanation:

The reaction given in the question is as follows -

Mg (s)  + Ni(NO₃)₂ (aq) ---- > Ni (s)  +  Mg(NO₃)₂ (aq)

From , the above equation , the change in oxidation state from the reactant t to the product is as follows -

• Mg is 0 to +2 ,

Since ,

The oxidation state is increasing , this is  oxidation process .

and , Mg , is a reducing agent .

• Ni⁺² is +2 to 0

Since ,

the oxidation state is decreasing , this is the reduction process .

and ,  Ni⁺² , is an oxidizing agent .

,

Hence , The correct statement is -

The nickel(II) ion is the oxidizing agent .