electrochemistry

Question 1

Oxidation Number or State

Answer 1

The apparent charge on an atom of an element in a molecule or in an ion is called
oxidation state or oxidation number of that atom.
Example:
In
+1 _1
H Cl

, oxidation state of hydrogen is +1 and that of Chlorine is -1.

Question 2

Electronegativity and oxidation number:

Answer 2

In any substance, the more electronegative atom has the negative oxidation number
while less electronegative element is given the positive oxidation number.

Question 3

Conduction is of two types.

Answer 3

(i) Electrolytic conduction
(ii) Electronic or metallic conduction

Question 4

Electrolytic Conduction:

Answer 4

The conduction in which current is carried by positively and negatively charged ions is solution or in fused state is called electrolytic conduction.

Question 5

Electronic Conduction or Metallic Conduction:

Answer 5

The conduction of electricity due to free movement of electrons in the metallic lattice is called electronic conduction or metallic conduction.

Question 6

Ionization:

Answer 6

The process of splitting of ionic compounds into charged particles when fused or dissolved in water is called ionization.

Question 7

Electrolysis:

Answer 7

The process in which non – spontaneous reaction takes place at the expense of electricity is called electrolysis.

Question 8

Electrochemical Cells:

Answer 8

A cell or a system which consists of electrodes dipped into an electrolyte in which a redox chemical reaction uses or generates electric current is called electrochemical cell.

Question 9

Types of Electrochemical Cells:

Answer 9

There are two types of electrochemical cells.
1.Electrolytic cell
2.Voltaic or galvanic cell