oxides

Question 1

What is an inorganic compound?

Answer 1

All compounds that do not contain carbon, except simpler compounds like oxides, carbonates, and carbides.

Question 2

List some common types of inorganic compounds found in nature.

Answer 2

• Silicates
• Oxides
• Carbonates
• Sulphides
• Sulphates
• Chlorides
• Nitrates

Question 3

How are inorganic compounds classified?

Answer 3

Into four groups: oxides, acids, bases, and salts.

Question 4

What is the chemical formula for acetic acid?

Answer 4

CH3COOH

Question 5

What is an example of a common salt?

Answer 5

Sodium chloride (NaCl)

Question 6

True or False: All metal compounds are inorganic.

Answer 6

True

Question 7

What are acidic oxides?

Answer 7

Oxides formed by the chemical combination of oxygen with nonmetals (Groups 14-17) that form acidic solutions when dissolved in water.

Question 8

Give an example of an acidic oxide.

Answer 8

Carbon dioxide (CO2)

Question 9

What are basic oxides?

Answer 9

Oxides composed of metals and oxygen that dissolve in water to give alkaline solutions.

Question 10

List some examples of basic oxides.

Answer 10

• Li2O
• Na2O
• K2O
• MgO
• CaO
• BaO
• CuO

Question 11

What is an amphoteric oxide?

Answer 11

An oxide that shows both acidic and basic behavior.

Question 12

Name two examples of amphoteric oxides.

Answer 12

• Aluminium oxide (Al2O3)
• Zinc oxide (ZnO)

Question 13

What reaction occurs when an acidic oxide reacts with a basic oxide?

Answer 13

They form salt.

Question 14

What is the common characteristic of acidic, basic, and amphoteric oxides?

Answer 14

They are all salt-forming oxides.

Question 15

What are neutral oxides?

Answer 15

Oxides that react neither with acids nor with bases.

Question 16

Give examples of neutral oxides.

Answer 16

• Water (H2O)
• Carbon monoxide (CO)
• Dinitrogen monoxide (N2O)
• Nitrogen monoxide (NO)

Question 17

What defines peroxides?

Answer 17

Compounds containing oxygen with an oxidation number of -1, having the peroxide link –O–O–.

Question 18

What is hydrogen peroxide’s chemical formula?

Answer 18

H2O2

Question 19

Fill in the blank: Acidic oxides react with bases to form _______.

Answer 19

Salt and water

Question 20

Fill in the blank: Basic oxides react with acidic oxides to form _______.

Answer 20

Salt

Question 21

What happens when acidic oxides dissolve in water?

Answer 21

They form acidic solutions.

Question 22

List the classification of oxides based on their properties.

Answer 22

• Acidic Oxides
• Basic Oxides
• Neutral Oxides
• Amphoteric Oxides
• Peroxides

Question 23

What are compounds that contain oxygen with oxidation number -1 called?

Answer 23

Peroxides

Peroxides contain the peroxide link “– O – O –”

Question 24

What is the chemical formula for hydrogen peroxide?

Answer 24

H2O2

Hydrogen peroxide is commonly used as a bleach and antiseptic.

Question 25

What kind of bond do the two oxygen atoms form in peroxides?

Answer 25

A peroxide link (– O – O –) ## Footnote This link connects the oxygen atoms to each other and to other elements.

Question 26

Give two examples of peroxides.

Answer 26

* Hydrogen peroxide (H2O2) * Sodium peroxide (Na2O2) ## Footnote Other examples include calcium peroxide (CaO2), barium peroxide (BaO2), and strontium peroxide (SrO2).

Question 27

How are most metal peroxides formed?

Answer 27

By burning metals in sufficient oxygen ## Footnote This process generates peroxides of metals.

Question 28

What is the physical state of hydrogen peroxide?

Answer 28

Colorless liquid ## Footnote Its solutions are usually used for bleaching and as an antiseptic.

Question 29

What happens to hydrogen peroxide when it decomposes?

Answer 29

It releases oxygen ## Footnote The reaction can be sped up by catalysts like MnO2 or Pt.

Question 30

What is the equation for the decomposition of hydrogen peroxide?

Answer 30

2H2O2 (aq) → 2H2O (l) + O2 (g) ## Footnote This represents the breakdown of hydrogen peroxide.

Question 31

What is hydrogen peroxide classified as due to its oxidizing power?

Answer 31

A strong oxidizing agent ## Footnote This property makes it effective for antiseptic applications.

Question 32

What occurs when hydrogen peroxide is added to a colored dye?

Answer 32

The color disappears due to oxidation ## Footnote For instance, black dye containing lead sulphide (PbS) turns white.

Question 33

What is the chemical equation for the oxidation of PbS by hydrogen peroxide?

Answer 33

PbS (s) + 4H2O2 → PbSO4 + 4H2O (l) ## Footnote This reaction illustrates the bleaching action of hydrogen peroxide.