M.C.Qs on Electrochemistry

M.C.Qs  on Electrochemistry ........Unit # 12

1. The splitting of aqueous sodium chloride into its ions is called:

(a)	Cleavage	(b)	Hydrolysis
(c)	Ionization	(d)	Hydration

2.    Ionization is a(an):

(a)	Directionless process	(b)	Irreversible process
(c)	Reversible process	(d)	Constant process

3.  The substance through which current can flow without change in its composition is called:

(a)	Conductor	(b)	Insulator
(c)	Semi-conductor	(d)	Electrolyte

4.  The substance through which electricity can flow in molten state or solution form is called:

(a)	Conductor	(b)	Insulator
(c)	Semi-conductor	(d)	Electrolyte

5.   Which one is not a strong electrolyte?

(a)	HCl	(b)	NaCl
(c)	CH3COOH	(d)	KOH

6.   Which one is a strong electrolyte?

(a)	H2SO4	(b)	NaOH
(c)	NaCl	(d)	All of them

7.     Which one is a weak electrolyte?

(a)	H2S solution	(b)	Ammonia solution
(c)	CH3COOH	(d)	All of the above

8.  Which one of the following is the best conductor of electricity when molten?

(a)	Sulphur	(b)	Sugar
(c)	Lead (II) iodide	(d)	Paraffin wax

9.  Which of the following could e added to water to make a solution which is a good conductor of electricity?

(a)	Copper	(b)	Ethanol or acetic acid
(c)	Caustic soda	(d)	Calcium carbonate

10. What ions are present in aqueous sodium sulphate solution?

(a)	Na+, SO42–, H+, OH–	(b)	Na+, SO42–, H+, O2–
(c)	Na2+, SO42–, H+, O2–	(d)	Na2+, SO42–

11.The electrical conductivity of an electrolyte depends upon:

(a)	Number of ions	(b)	Degree of dilution
(c)	Temperature	(d)	All of the above

12. The process in which electric current is used to bring about a non-spontaneous redox reaction is called:

(a)	Pyrolysis	(b)	Hydrolysis
(c)	Electrolysis	(d)	Hydration

13. A cell in which electric current is used to bring about a non-spontaneous redox reaction is called:

(a)	Electrochemical cell	(b)	Electrolytic cell
(c)	Galvanic cell	(d)	Voltaic cell

14. A cell in which electric current is produced from a spontaneous redox reaction is called:

(a)	Electrochemical cell	(b)	Electrolytic cell
(c)	Galvanic cell	(d)	Voltaic cell

15.  During electrolysis of 18 g of acidified water, H₂ released at cathode at s.t.p. is:

(a)	22.4 liter	(b)	11.2 liter
(c)	5.6 liter	(d)	44.8 liter

16. Electrolysis of acidified water gives off oxygen at ……. and hydrogen gas at …….respectively.

(a)	Cathode, anode	(b)	Anode, anode
(c)	Anode, cathode	(d)	Cathode, cathode

17. Which one of the following elements is extracted by electrolysis?

(a)	Carbon	(b)	Sodium
(c)	Nitrogen	(d)	Zinc

18. Which one of the following elements is not extracted by electrolysis?

(a)	Aluminium	(b)	Magnesium
(c)	Potassium	(d)	Copper

19.       Which type of elements are extracted by electrolysis?

(a)	Transition elements	(b)	Noble gases
(c)	Representative elements	(d)	Less reactive el ements

20. Which type of elements cannot be extracted by electrolysis?

(a)	Transition elements	(b)	More reactive elements
(c)	Representative elements	(d)	All elements can be extracted.

21.      Electrolysis involves:

(a)	Movement of cations and anions of an electrolyte towards their respective electrodes.
(b)	Electrolytic decomposition of electrolytes.
(c)	Deposition of ions as neutral species on electrodes in an electrolytic cell.
(d)	All of the above.

22.      An electrolytic cell is one which involves:

(a)	Conversion of electrical energy into chemical energy.
(b)	Conversion of chemical energy into electrical energy.
(c)	Both a and b.
(d)	None of the above.

23.    A Galvanic or Voltaic cell is one which involves:

(a)	Conversion of electrical energy into chemical energy.
(b)	Conversion of chemical energy into electrical energy.
(c)	Both a and b.
(d)	None of the above.

24.  Which one of the following is correct regarding cathode?

(a)	Cathode is the electrode at which reduction takes place.
(b)	Cathode is the negative electrode in an electrolytic cell whereas in a Galvanic cell it is the positive electrode.
(c)	In both electrolytic and Galvanic cells, cations move towards the cathode.
(d)	All of the above.

25.  Which one of the following is correct regarding anode?

(a)	Anode is the electrode at which oxidation takes place.
(b)	Anode is the positive electrode in an electrolytic cell whereas in a Galvanic cell it is the negative electrode.
(c)	In both electrolytic and Galvanic cells, anions move towards the anode.
(d)	All of the above.

26. Which one of the following is correct regarding salt bridge?

(a)	Salt bridge is a device that keeps internal continuity between the two half cells of a Galvanic cell by means of an inert salt solution placed in the u-tube.
(b)	It completes the cell circuit and also maintains the electrical neutrality by diffusion of ions through it.
(c)	In cell reaction, a salt bridge is represented by two vertical lines[‌║]
(d)	All of the above.

27.  Which particles are responsible for the conduction of electricity through

            (i) metals,                               (ii)        electrolytes:

	(i) Metals	(ii) Electrolytes
(a)	Negative ions	Positive ions
(b)	Electrons	Electrons
(c)	Electrons	Positive & negative ions
(d)	Positive ions	Positive & negative ions

28.Which one of the following correctly describes the process occurring at the electrodes when molten sodium chloride is electrolyzed?

	Anode	Cathode
(a)	Oxidation	Reduction
(b)	Reduction	Oxidation
(c)	Oxidation	Oxidation
(d)	Reduction	Reduction

29. Which of the following products are given off at the electrodes during the electrolysis of molten magnesium chloride between carbon electrodes?

	Anode	Cathode
(a)	Magnesium	Chlorine
(b)	Oxygen	Magnesium
(c)	Chlorine	Hydrogen
(d)	Chlorine	Magnesium

30. What are the products of the electrolysis of dilute sulphuric acid using inert electrodes?

	Anode	Cathode
(a)	Hydrogen	Oxygen
(b)	Hydrogen	Carbon dioxide
(c)	Sulphur dioxide	Oxygen
(d)	Oxygen	Hydrogen