Why is iron passive with conc HNO3?

nitric acid is a strong oxidizing agent. It oxidizes iron to form a layer of Fe2O3. This layer is non-reactive and cannot be oxidized further. Therefore, iron becomes passive to further reaction.

What becomes passive in concentrated nitric acid?

Complete answer: When treated with pure concentrated nitric acid, metals such as iron, aluminium, cobalt, and nickel become inert or passive owing to the creation of a very thin coating of insoluble metallic oxide on the surface. This layer that has developed prevents the bulk from reacting further.

Which of the following metals are passive towards conc hno3?

Iron is rendered passive with fuming nitric acid.

What is passive iron?

(Chem.) iron which has been subjected to the action of heat, of strong nitric acid, chlorine, etc. It is then not easily acted upon by acids.

Which of the following metals are passive with conc HNO3?

Amongst the following, the metals which become passive when dipped in conc. HNO_(3)” are “Sn,Pb,Fe,Cr,Zn,Ni,Hg,Al,Cu. 4, i.e., Fe, Cr, Ni and Al become passive when dipped in conc. HNO3.

Which metals are passive towards HNO3?

Answer: Of the given metals – Al, Ni, Co, Fe, Cr are passive to HNO3 due to formation of oxide film on their surface. Mn and Zn do react with HNO3.

Which of the following metal becomes passive with HNO3?

Fe, Cr, Ni and Al becomes passive when dipped in conc. HNO3.

What is passive iron how it is removed?

Iron becomes inert when reacted with nitric acid due to the formation of extremely thin layer of insoluble metallic oxide which stops the reaction. Passivity can be removed by rubbing the surface layer with the sand paper or by treating with strong reducing agent.

What is passivity action of iron?

When a piece of iron is brought in contact with dilute sulphuric acid, a vigorous reaction begins and hydrogen gas starts coming out. The same piece of iron will displace copper from a solution of copper sulphate. Iron in this form is said to be passive, i.e., it shows lesser reactivity than it would normally show.

Does SN become passive with conc HNO3?

HNO_(3)” are “Sn,Pb,Fe,Cr,Zn,Ni,Hg,Al,Cu. 4, i.e., Fe, Cr, Ni and Al become passive when dipped in conc. HNO3.

Which metal is rendered passive by hno3?

iron
Due to the formation of a reddish brown layer of iron oxide which prevents its further reaction with the acid, iron is made passive with fuming nitric acid.

What happens when iron is dipped in HNO3 solution?

Answer: When iron is dipped in conc. HNO 3, it becomes chemically inert or passive due to the formation of a layer of iron oxide (Fe 3 O 4) on its surface. Concentrated nitric acid can be used to coat metals like iron, chromium, aluminium, and calcium, forming a protective oxide film that prevents further reactions.

Why does iron become passive in nitric acid reaction?

Answer: nitric acid is a strong oxidizing agent. It oxidizes iron to form a layer of Fe2O3. This layer is non-reactive and cannot be oxidized further. Therefore, iron becomes passive to further reaction. Explanation: please mark me brainliest and follow me

Why doesn’t Fe2O3 oxidize in concentrated HNO3?

Because a layer of iron (III) oxide is formed on the surface of the metal, which is incapable of further reaction with the acid – concentrated HNO3 acts as an oxidising agent rather than as a standard acid & Fe2O3 won’t oxidise any further.

Which of the following metals is rendered passive with fuming nitric acid?

Iron is rendered passive with fuming nitric acid. Metals like iron, aluminium,cobalt and nickel become inert or you can say passive when treated with pure concentrated nitric acid due to the formation of an extremely thin layer of insoluble metallic oxide on the surface. This layer formed stops the further reaction with the bulk.