Oxidation And Reduction

Question 1

What is oxidation in terms of electron transfer and oxidation number

Answer 1

The loss of electrons and increase in oxidation number.

Question 2

What is reduction in terms of electron transfer and oxidation number

Answer 2

The gain of electrons and the decrease in oxidation number.

Question 3

Oxidation numbers are assigned r……

Answer 3

Rules

Question 4

Oxidation number can be p……….or n………..

Answer 4

Positive or negative

Question 5

What are oxidant agent

Answer 5

A substance that causes other substance to be oxidised.
OXIDISING AGENTS ARE ALWAYS THEMSELVES REDUCED ( gains electrons )

Question 6

What are reducing agent

Answer 6

A substance that causes another substance to be reduced.
REDUCING AGENTS ARE ALWAYS THEMSELVES REDUCED ( loses electrons )

Question 7

Oxidation number rule 1

Answer 7

The oxidation number if any uncombined oxygen element is zero.

Question 8

Oxidation number rule 2

Answer 8

The oxidation number of an ions is the same as its charge

Question 9

Oxidation number rule 3

Answer 9

The oxidation number of all elements in a neutral compound must add up to zero.

Question 10

Oxidation number rule 4 ( golden rule )

Answer 10

Oxygen generally had an oxidation number of -2.

TWO EXEMPTIONS:
hydrogen peroxide (H2O2) = -1
OF2 = +2

Fluorine= -1 mosh electronegative atom

Question 11

Rule 5 of oxidation number

Answer 11

Hydrogen generally has +1

ONE EXCEPTION:
METAL HYDRIDES =-1

Question 12

Rule 6 for oxidation number

Answer 12

Halogens has an oxidation number of -1.
ONE EXEMPTION:
when bonded to more electronegative atoms it’s oxidation number can vary.

Question 13

Rule 7 for oxidation number

Answer 13

The sum of the oxidation number of all the elements in a complex ion must equal to its charge.

Question 14

Imp.

Oxidised means r………a……

Answer 14

Reducing agent

Question 15

Reduction means o……….a……..

Answer 15

Oxidising agent