9th class chemistry Chapter no.7 MCQs
Unit no.7 MCQS of 9th Class Chemistry
Electrochemistry:
1. Electrochemistry is the branch of chemistry which deals with:
a. Electricity and chemical reactions
b. Carbon and its compounds
c. Metals and non metals
d. Solute and solution
2. The branch of chemistry which describes a relation between electricity and chemical reactions is called:
a. Electrochemistry
b. Organic chemistry
c. Industrial chemistry
d. Inorganic chemistry
3. Oxidation process consists:
a. Removal of electrons
b. Addition of oxygen
c. Addition of hydrogen
d. Addition of electrons
4. The oxidation reduction reactions are collectively called:
a. Galvanic reactions
b. Oxidizing reactions
c. Redox reactions
d. Reduction reactions
5. Spontaneous reactions produce:
a. Solutions
b. Electricity
c. Electrolytes
d. Vibrations
6. Addition of oxygen is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
7. Removal of hydrogen is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
8. Addition of hydrogen is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
9. Removal of oxygen is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
10. Gaining of electron is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
11. Losing an electron is called:
a. Non Spontaneous reaction
b. Reduction reaction
c. Oxidation reaction
d. Spontaneous reaction
12. During a reaction between zinc oxide and carbon,
carbon:
a. Breaks
b. Oxidizes
c. None
d. Reduces
13. The oxidation state of sodium is:
a. +2
b. +1
c. -2
d. -1
14. The oxidation number of chromium K2 Cr2O7 in is:
a. +14
b. +2
c. +7
d. +6
15. The oxidation number of H in HCl is:
a. +2
b. -1
c. +1
d. -2
16. The oxidation number of all elements in the free state is:
a. -2
b. -1
c. 0
d. +1
17. The oxidation number of hydrogen in metal hydrides is:
a. +1
b. -1/2
c. -1
d. 0
18. The oxidation number of oxygen in per oxides is:
a. +2
b. -1/2
c. -2
d. -1
19. The oxidation number of nitrogen in nitric acid is:
a. +5
b. -5
c. +6
d. 5
20. The oxidation number of sulphur in sulphuric acid is:
a. +5
b. +6
c. -5
d. -6
21. The oxidation number of chorine in potassium chlorate KClO3 is:
a. +5
b. +4
c. -1
d. -2
22. In the redox reaction between Zn and HCl, the oxidizing agent is:
a. CI–
b. Zn
c. H2
d. H+
23. The specie which reduces the matter giving electron is called:
a. Coloring agent
b. Oxidizing agent
c. Dehydrating agent
d. Reducing agent
24. The specie which oxidizes the matter gaining an electron is called:
a. Coloring agent
b. Oxidizing agent
c. Dehydrating agent
d. Reducing agent
25. Formation of water from hydrogen and oxygen is:
a. Neutralization
b. Redox reaction
c. Decomposition
d. Acid-base reaction
26. Addition of oxygen in chemical reaction is called:
a. Neutralization
b. Redox reaction
c. Decomposition
d. Acid-base reaction
27. Which of the following does not occur during the formation of water by hydrogen and oxygen?
a. Oxygen gains electrons
b. Oxidation of hydrogen
c. Hydrogen works as an oxidizing agent
d. Reduction of oxygen
28. Removal of electrons is called:
a. Hydration
b. Oxidation
c. Hydrogenation
d. Reduction
29. Addition of electrons is called:
a. Redox
b. Reduction
c. Electrolytes
d. Oxidation
30. The oxidation number of oxygen in water is:
a. +2
b. +1
c. -2
d. -1
31. The oxidation number of hydrogen in water is:
a. +2
b. +1
c. -2
d. -1
32. Spontaneous chemical reactions take place in:
a. Nelson’s cell
b. Electrolytic cell
c. Downs cell
d. Galvanic cell
33. Which one of the following is not an electrolytic cell?
a. Nelson’s cell
b. Downs cell
c. Galvanic cell
d. Both a and c
34. Which one of the following is not an electrolyte?
a. Lime solution
b. Sugar solution
c. Sodium chloride solution
d. Sulphuric acid solution
35. Nelson cell is used for the preparation of caustic soda
along with gases. Which of the following gas is produced at cathode?
a. O3
b. Cl2
c. O2
d. H2
36. Which of the following is not an electrolytic cell?
a. Nelson cell
b. Down’s cell
c. Galvanic cell
d. A and C both
37. Example of strong electrolyte is:
a. C6H6
b. CH3 COOH
c. NaOH
d. CaOH2
38. Which of the following is not an electrolyte?
a. Benzene
b. Solution of sodium chloride
c. Urea
d. Sugar solution
39. Anode of Down’s cell is made of:
a. Graphite
b. Iron
c. Zinc
d. Steel
40. Example of non electrolyte is:
a. NaOH
b. CH3COOH
c. NaCl
d. Sugar
41. The types of electrochemical cells:
a. Four
b. Two
c. Five
d. Three
42. Weak electrolyte is:
a. H2SO4
b. NaCl
c. CH3COOH
d. NaOH
43. Which of the following is a weak electrolyte?
a. HNO3
b. H2SO4
c. CH3 COOH
d. HCI
44. Which of the following is a strong electrolyte?
a. Pure solution
b. Solution of common salt
c. Benzene
d. Sugar solution
45. Aqueous solution of …… is not a strong electrolyte:
a. H2SO4
b. NaCl
c. Ca(OH)2
d. NaOH
46. Which of the following method is used for the preparation of sodium metal?
a. Galvanic cell
b. Nelson cell
c. Electroplating
d. Down’s cell
47. Pure water is an example of:
a. Strong electrolyte
b. Electrolyte
c. Non electrolyte
d. Weak electrolyte
48. Aqueous solution of NaCl is called:
a. Carbonated solution
b. Starch solution
c. Brine solution
d. Chloride solution
49. …… is obtained from molten NaCl
a. Both
b. NaOH
c. None
d. Sodium metal
50. …… is a non electrolyte:
a. Sugar Solution
b. NaCl Solution
c. H2 SO4 Solution
d. NaOH Solution
51. The example of non electrolyte is:
a. H2SO4
b. NaOH
c. C6H6
d. HCl
52. Which of the following metal is used for galvanizing?
a. Cr
b. Fe
c. Zn
d. Cu
53. Gas which is collected at cathode is called:
a. H2
b. Cl2
c. O2
d. O3
54. The types of electrolytes are:
a. 2
b. 4
c. 5
d. 3
55. The substances which conduct electricity in their aqueous solutions are called:
a. Galvanic cells
b. Electrolytes
c. Non electrolytes
d. Electrochemical cells
56. The substances which do not allow current to pass are called:
a. Weak electrolytes
b. Non electrolytes
c. Electrolytes
d. Strong electrolytes
57. Benzene is an example of:
a. Weak electrolytes
b. Non electrolytes
c. Electrolytes
d. Strong electrolytes
58. Sulphuric acid is an example of:
a. Weak electrolytes
b. Non electrolytes
c. Electrolytes
d. Strong electrolytes
59. The electricity can not pass through:
a. Aqueous solution of NaCl
b. NaCl
c. Molten NaCl
d. All
60. The process that takes place in electrolytic cell is called:
a. Electrolysis
b. Oxidation
c. Electricity
d. Reduction
61. In electrolytic cell, the cell connected to positive terminal
is called:
a. Electrolyte
b. Cathode
c. Solution
d. Anode
62. In electrolytic cell, the cell connected to negative terminal is called:
a. Electrolyte
b. Cathode
c. Solution
d. Anode
63. Daniel cell is an example of:
a. Down’s cell
b. Galvanic cell
c. Nelson cell
d. Electrolytic cell
64. In Daniel cell, the cathode is made of:
a. Copper
b. Zinc
c. Carbon
d. Iron
65. The first electric cell was discovered in:
a. 1700
b. 1500
c. 1800
d. 1600
66. The formula of rust is:
a. FeOH3
b. Fe2 O3 .nH2 O
c. none
d. Fe2 O3
67. The most common example of corrosion is:
a. Rusting of aluminium
b. Chemical decomposition
c. Rusting of tin
d. Rusting of iron
68. The method of depositing of the layer of one metal on the other metal is called:
a. Electroplating
b. Reduction
c. Oxidation
d. Corrosion
69. Corrosion is an example of:
a. Redox reaction
b. Oxidation reaction
c. Chemical reaction
d. Reduction reaction
70. The electroplating of silver is carried out in:
a. Down’s cell
b. Electrolytic cell
c. Galvanic cell
d. Nelson cell
71. During the electroplating of silver, the anode used is made of:
a. Iron
b. Silver
c. Nickel
d. Aluminium
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