Chemistry

Oxidation States and Oxides

308 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 thermodynamic principles of metallurgy general principles and processes of isolation of elements metallurgy chemistry

$Fe _3O _4$ is the chemical formula of :

  1. monazite

  2. magnetite

  3. haematite

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

$Fe _3O _4$ is the chemical formula of magnetite.

Magnetite is the mineral of Iron.
Magnetite is the most magnetic of all the naturally-occurring minerals on Earth.
The chemical IUPAC name is Iron(ll,lll) oxide and the common chemical name is ferrous-ferric oxide.
So answer is B.

Multiple choice

What is the name of the compound with the formula $Fe_2O_3$?

  1. Iron(II) oxide

  2. Iron(III) oxide

  3. Iron(IV) oxide

  4. Iron(V) oxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The compound with the formula $Fe_2O_3$ is called iron(III) oxide, also known as ferric oxide.

Multiple choice

What is the process by which a substance loses electrons called?

  1. Oxidation

  2. Reduction

  3. Electrolysis

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

Oxidation is the process by which a substance loses electrons, resulting in an increase in its oxidation state.

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 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.