Question

11. Which of the following statement is not correct?
(A) Corrosion is the process in which metals are eaten up gradually by the action of air,
moisture or a chemical (such as an acid) on their surface.
(B) The rusting of iron is a redox reaction.
(C) Corrosion weakens the iron and steel objects.
(D) Chemical formula of rust is Fe304 xH20
12. Antioxidants are
(A) Reducing agents
(B) Oxidising agents
(C) Salts
(D) None of these
13. Reduction means
(A) Loss of oxygen
(B) Gain of hydrogen
(C) Both (1) and (2)
(D) None of these

please answer all
correct answer will be marked as brainliest​

Answer 1

Answer:

The statement which are not correct are as follows:

1) The option D) Chemical formula of rust is Fe₃O₄+ H₂O is incorrect.

2) The option B) Oxidising agents is incorrect.

3) The option D) None of these is incorrect.

Explanation:

1) Corrosion is the progressive deterioration of metals caused by the action of air, moisture, or a chemical (such as acid) on their surface. Iron and steel objects lose strength due to corrosion. The most frequent type of corrosion is the rusting of iron metal. Iron rusting is a type of redox reaction. Rust has the chemical formula Fe₂O₃.

2) Antioxidants are chemicals that inhibit oxidants. Thus, antioxidants limit the harm that is done by oxidants. Because they perform the antioxidant function by being oxidized, antioxidants can be called reducing agents.

3) In the process of reduction, oxygen or any other electronegative element is removed while hydrogen or any other electropositive element is added.

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Answer 2

Answer:

11. The incorrect statement is (D) Chemical formula of rust is Fe304 xH20.

Explanation:

• Corrosion is the process by which gases and water vapours in the atmosphere slowly eat away at metals due to the formation of certain compounds such as oxide, sulphides, carbonate, and so on.
• Corrosion of iron is known as rusting.
• Rust is the chemical formula for hydrated Ferric oxide. Fe₂O₃.xH₂O

12.Antioxidants are (A) Reducing agents

Explanation:

Antioxidants slow down the  chain reactions by removing free radical intermediates, and they eventually inhibit other oxidation reactions by being oxidised. Antioxidants often play the role of a reducing agent, e.g., thiols or polyphenols.

13. Reduction means (C) Both (1) and (2)

Explanation:

Reduction is the gain of hydrogen or the loss of oxygen.

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