Chemistry

Oxidation States and Oxides

334 Questions

Oxidation states represent the degree of oxidation of an atom in a chemical compound. This topic covers calculating valency, classifying oxides as acidic or basic, and understanding thermal decomposition. These concepts are frequently tested in chemistry sections across multiple competitive examination platforms.

calculating oxidation statesclassification of oxidesvalency determinationthermal decompositionstability of metal oxides

Oxidation States and Oxides Questions

Multiple choice

What is the chemical formula for oxygen?

  1. CO2

  2. CH4

  3. NH3

  4. O2

  5. H2O
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The chemical formula for oxygen is O2.

Multiple choice

What is the significance of zero in the concept of oxidation states?

  1. It represents the neutral state of an atom.

  2. It indicates the loss of electrons by an atom.

  3. It signifies the gain of electrons by an atom.

  4. It denotes the transfer of electrons between atoms.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In the context of oxidation states, zero represents the neutral state of an atom, where it has neither gained nor lost electrons. This neutral state serves as a reference point for determining the oxidation states of atoms in various compounds.

Multiple choice

What is the chemical formula for ozone?

  1. O

  2. O2

  3. O3

  4. O4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone has the chemical formula O3, consisting of three oxygen atoms.

Multiple choice

What is the chemical formula for pyrite?

  1. FeS

  2. FeS2

  3. Fe2O3

  4. FeCO3
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pyrite, also known as fool's gold, has the chemical formula FeS2. It is an iron sulfide mineral with a brassy yellow color.

Multiple choice

What is the chemical formula for sodium nitrite?

  1. NaNO2

  2. NaNO3

  3. NaClO2

  4. Na2SO3
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The chemical formula for sodium nitrite is NaNO2.

Multiple choice

What is the oxidation state of nitrogen in nitrites?

  1. +3

  2. +4

  3. +5

  4. +6
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The oxidation state of nitrogen in nitrites is +3.

Multiple choice

What is the chemical formula for Sulfur Dioxide?

  1. SO3

  2. SO4

  3. SO2

  4. S2O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sulfur Dioxide has the chemical formula SO2, consisting of one sulfur atom and two oxygen atoms.

Multiple choice

What is the chemical formula for ozone?

  1. O

  2. O2

  3. O3

  4. O4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ozone is a molecule composed of three oxygen atoms, hence its chemical formula is O3.

Multiple choice

What is the common oxidation state of Group 1 elements?

  1. +1

  2. +2

  3. +3

  4. +4

  5. +5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Group 1 elements typically exhibit a +1 oxidation state because they have one valence electron, which they readily lose to achieve a stable octet configuration.

Multiple choice

What is the chemical formula of the compound formed when magnesium reacts with oxygen?

  1. MgO

  2. Mg2O

  3. MgO2

  4. Mg2O3

  5. Mg3O4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Magnesium reacts with oxygen to form magnesium oxide (MgO), a white, ionic compound with a high melting point. It is commonly used as a refractory material and in the production of cement.

Multiple choice

What is the common oxidation state of Group 2 elements?

  1. +1

  2. +2

  3. +3

  4. +4

  5. +5
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Group 2 elements typically exhibit a +2 oxidation state because they have two valence electrons, which they readily lose to achieve a stable octet configuration.

Multiple choice

What is the name of the compound formed when strontium reacts with oxygen?

  1. Strontium oxide

  2. Strontium dioxide

  3. Strontium trioxide

  4. Strontium tetroxide

  5. Strontium pentoxide
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Strontium reacts with oxygen to form strontium oxide (SrO), a white, crystalline compound that is used in the production of fireworks, ceramics, and electronic devices.

Multiple choice

What is the general formula for an oxide?

  1. A2O

  2. AO

  3. A2O3

  4. AO2
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The general formula for an oxide is AO, where A represents a metal and O represents oxygen.

Multiple choice

Which of the following is an example of a basic oxide?

  1. Calcium oxide (CaO)

  2. Nitrogen dioxide (NO2)

  3. Silicon dioxide (SiO2)

  4. Hydrogen oxide (H2O)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Calcium oxide (CaO) is a basic oxide because it reacts with water to form calcium hydroxide (Ca(OH)2), a strong base.

Multiple choice

What is the name of the oxide that is commonly used as a bleaching agent?

  1. Sodium hypochlorite (NaClO)

  2. Calcium hypochlorite (Ca(OCl)2)

  3. Potassium hypochlorite (KOCl)

  4. Magnesium hypochlorite (Mg(OCl)2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodium hypochlorite (NaClO) is commonly used as a bleaching agent because it is a strong oxidizing agent that can remove stains and kill bacteria.