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Very Short Question and Answers - Oxidation

Q 1.
What substance is formed when copper powder is oxidized?

Ans:

Copper(II) oxide is formed when copper powder is oxidized.

Q 2.
What color change occurs when copper is oxidized?

Ans:

The copper powder turns black when it is oxidized to copper(II) oxide.

Q 3.
What happens when hydrogen gas is passed over heated copper(II) oxide?

Ans:

The black coating of copper(II) oxide turns brown as copper is obtained.

Q 4.
In the reaction CuO + H₂ → Cu + H₂O, what is being reduced?

Ans:

Copper(II) oxide (CuO) is being reduced.

Q 5.
If a substance gains oxygen, what is it said to be?

Ans:

It is said to be oxidized.

Q 6.
What term is used for reactions where one substance is oxidized and another is reduced?

Ans:

These types of reactions are called oxidation-reduction reactions or redox reactions.

Q 7.
What happens to carbon in the reaction ZnO + C → Zn + CO?

Ans:

Carbon is oxidized to carbon monoxide (CO) in this reaction.

Q 8.
What does corrosion refer to?

Ans:

Corrosion refers to the process by which metals are attacked by substances like moisture and acids, leading to deterioration.

Q 9.
What is rusting?

Ans:

Rusting is the corrosion of iron, resulting in a reddish-brown powder (iron oxide).

Q 10.
What color does copper turn when it corrodes?

Ans:

Copper develops a green coating when it corrodes.

Q 11.
How can oxidation of fats and oils in food be prevented?

Ans:

Oxidation can be prevented by adding antioxidants and storing food in airtight containers.

Q 12.
What effect does oxidation have on food containing fats and oils?

Ans:

Oxidation causes fats and oils to become rancid, changing their smell and taste.

Q 13.
Which substance is formed by the oxidation of magnesium in burning?

Ans:

Magnesium oxide is formed when magnesium burns in the presence of oxygen.

Q 14.
What is the black coating on silver due to?

Ans:

The black coating on silver is a result of corrosion.

Q 15.
Which gas is used by chips manufacturers to prevent oxidation?

Ans:

Nitrogen gas is used to flush bags of chips to prevent oxidation.

Q 16.
What does it mean when a substance loses oxygen?

Ans:

It means the substance is being reduced.

Q 17.
What does oxidation lead to in terms of chemical changes?

Ans:

Oxidation leads to the formation of oxides from the original substances.

Q 18.
Why is corrosion considered a problem for metal structures?

Ans:

Corrosion damages metal structures, leading to costly repairs and replacements.

Q 19.
What is the significance of using antioxidants in food?

Ans:

Antioxidants are significant because they help prevent the oxidation of fats and oils, thereby maintaining the food's quality.

Q 20.
In the reaction MnO₂ + 4HCl → MnCl₂ + 2H₂O + Cl₂, what is oxidized?

Ans:

In this reaction, hydrochloric acid (HCl) is oxidized to chlorine gas (Cl₂).

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