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 chemistry metals chemical properties and uses of metals and non-metals introduction to metals physical properties of non-metals

The oxides of nonmetal which is neutral is :

  1. $SO _2$
  2. $NO _2$
  3. $P _2O _3$
  4. $CO$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Neutral oxides are the oxides which show neither basic nor acidic properties when they react with water and they do not form salts when reacted with acids or bases, e.g., carbon monoxide$ (CO)$,nitrous oxide$ (N _2O)$,nitric oxide $(NO),$ etc., are neutral oxides.

Multiple choice chemistry chemistry in everyday life metal oxides and non metal oxides reactions of acids and bases properties of acids and bases

The more non-metallic character of an element represents,  _______  oxide.

  1. less acidic

  2. more acidic

  3. neutral

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

Generally, more metallic character of an element represent, formation of more basic oxide. Likewise, the more non-metallic character an element has, the more acidic oxide. The metallic character of an element can be determined by its position on the periodic table.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Metals oxides are:

  1. basic in nature

  2. electrovalent (ionic) in nature

  3. able to turn red litmus solution blue

  4. all of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Metal oxides typically contain an anion of oxygen in the oxidation state of -2. Oxides which are reacted only by acids are basic oxides. Metals form basic oxides so they can turn red litmus blue as it is alkaline in nature.

Multiple choice chemistry metals reaction of metals reactions of metals chemical properties of metals

Which of the following elements produces basic oxide on reacting with oxygen?

  1. Chorium

  2. Sulphur

  3. Sodium

  4. Magnesium
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Sodium and magnesium metal reacts with the oxygen of the air at room temperature to form sodium oxide and magnesium oxide respectively. These oxides react with water to form hydroxides.
$4Na + O _2 \rightarrow 2Na _2O$
$Na _2O + H _2O \rightarrow 2NaOH$
$2Mg + O _2 \rightarrow 2MgO$
$MgO + H _2O \rightarrow Mg(OH) _2$

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

Which of the following is NOT a type of in-situ chemical oxidation?

  1. Fenton's reagent

  2. Hydrogen peroxide

  3. Ozone

  4. Natural attenuation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Natural attenuation is a process that removes contaminants from groundwater naturally, not a type of in-situ chemical oxidation.