Redox Reactions

In a redox reaction, the species that loses electrons is called:

1. Oxidising agent
2. Reducing agent
3. Catalyst
4. Product

The oxidation number of nitrogen in NH3 is:

1. +3
2. -3
3. +5
4. 0

The loss of electrons is known as:

1. Reduction
2. Oxidation
3. Neutralisation
4. Hydrolysis

The oxidation number of sulphur in H2SO4 is:

1. +2
2. +4
3. +6
4. -2

Which of the following is an oxidising agent?

1. Substance that loses electrons
2. Substance that gains electrons
3. Substance that increases its oxidation number
4. Substance that undergoes oxidation

The oxidation state of hydrogen in metal hydrides is:

1. +1
2. -1
3. 0
4. +2

A reaction in which the same element undergoes oxidation as well as reduction is called:

1. Displacement reaction
2. Disproportionation reaction
3. Combination reaction
4. Neutralisation reaction

The oxidation number of chlorine in HClO4 is:

1. +1
2. +3
3. +5
4. +7

In the reaction Zn + CuSO4 -> ZnSO4 + Cu, zinc acts as:

1. Oxidising agent
2. Reducing agent
3. Catalyst
4. Salt

Reduction is defined as:

1. Loss of electrons
2. Gain of electrons
3. Loss of oxygen
4. Increase in oxidation number

The oxidation number of manganese in KMnO4 is:

1. +2
2. +4
3. +6
4. +7

The substance that causes oxidation of another substance is called:

1. Reducing agent
2. Oxidising agent
3. Catalyst
4. Solvent

The oxidation number of an element in its free state is:

1. 1
2. -1
3. 0
4. Equal to atomic number

The oxidation number of oxygen in most compounds is:

1. +1
2. -1
3. -2
4. +2

A reaction in which oxidation and reduction occur simultaneously is called:

1. Combination reaction
2. Redox reaction
3. Decomposition reaction
4. Neutralisation reaction