Question

Rusting of iron is  

(A) Fast, desirable, irreversible, chemical change 

(B) Fast, undesirable, irreversible, chemical change 

(C) Slow ,desirable,irreversible,chemical change 

(D) Slow ,undesirable,irreversible,chemical change​

Answer 1

Slow,desirable, irreversible,chemistry change

Answer 2

Rusting of Iron is a Slow, Undesirable, irreversible and a chemical change.(option d)

• Rusting of Iron is loss of iron  / damage of the iron through oxidation properties.
• Rusting is generally a very slow process , but it can be faster when the chemicals of high concentrations are used.
• Rusting of iron is an undesirable change , because rusting leads to damage / cracks on the iron which make them very loose in bonding in the rusting process.(Undesirable refers to loss to the machines/others)
• Rusting involves chemical reactions with Oxygen and some amount of water , So it is considered as a chemical reaction.
• Any type of chemical reactions are always irreversible . Physical reactions can be reversible , So . Rusting of Iron is also irreversible.
• So, option d i.e, Rusting of iron is a Slow , undesirable , irreversible and chemical reaction is the correct answer.