In sha Allah no mcq will come out of this in the exams...!

1. Chapter 8
Thermochemistry
(To shine your face make nimaz (salah) base
because life is race and in this case to
fasten the pace don’t create mess)
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

2.  Definitions
1. Electrochemistry: - It is the branch of
chemistry which deals with the relationship of
electrical and chemical energies and their
interconversion.
2. Electrolyte: -The substance capable of being
dissociated into ions on the passage of
electricity in the molten state.
3. Non-eclectrolytes: - The chemical compounds
which do not conduct electricity in molten or
aqueous solutions are called non electrolytes.
4. Electrolysis: -The breakage of a solution on the
passage of electric current.
5. Anode: -the positively charged electrode where
oxidation occurs.
6. Cathode: -the negatively charged electrode
where reduction takes place is called cathode.
7. Ampere: - It is the S.I unit of current which is
defined as the current when passed through a
circuit for one second.
8. Columb: - It is the S.I unit of electric charge
and is defined as the quantity of charge when
one ampere of current is passed for one second.
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

3. 9. Electroplating: - It is the process of electrolysis
which is used to coat one metal onto the other.
10. Electrochemical cell: - The cell which is used
to convert electrical energy into chemical
energy and vice versa is called electrochemical
cell.
 Multiple Choice Questions
1. Chemical and electrical energies are inter
convertible:
a) true b) false
2. all acids, bases and salts are electrolytes in
aqueous solutions or fused state.
a) true b) false
3. all the conductors are electrolytes.
a) true b) false
4. which of the following does not conduct
electricity.
a) salt b) water
c) sugar d) N.O.T
5. all are true about cathode except:
a) is negatively charged
b) positive ions move towards it
c) oxidation takes place over it
d) Na+
ions become Na
e) N.O.T
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

4. 6. all are true about anode except:
a) is positively charged
b) oxidation takes place
c) Cl becomes Cl-
d) negative ions moves towards it
e) N.O.T
7. Columb= ?
a) current * time b) current / time
c) current + time d) current – time
8. 1F = ?
a) 500C b) 6500C
c) 96500C d) 1000 C
9. What is the charge when 2 A current passes for
2 seconds:
a) 1 b) 2
c) 3 d) 4
10. electrolysis is used for the extraction of certain
metals from their ores.
a) true b) false
11. coating of metal by non metal is called plating
a) true b) false
12. a cell which converts electrical energy into
chemical energy is called voltaic cell
a) true b) false
13. lead storage battery is a reversible cell.
a) true b) false
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

5. Answer Key
1 A 2 A 3 B
4 C 5 C 6 C
7 A 8 C 9 D
10 A 11 B 12 B
13 A
Chemistry Def. & MCQs Dr. Sajid Ali Talpur

6. Answer Key
1 A 2 A 3 B
4 C 5 C 6 C
7 A 8 C 9 D
10 A 11 B 12 B
13 A
Chemistry Def. & MCQs Dr. Sajid Ali Talpur