Chemistry Class 9 Chapter 7 MCQs Federal Board
Electrochemistry Important MCQs
Class 9 Chapter 7
1. Loss of electrons is termed as ___
A. Reduction
B. Hydrogenation
C. Oxidation
D. None of these
ANSWER: C. Oxidation
2. Gain of electrons is characterized as ____
A. Oxidation
B. Reduction
C. Both
D. None
ANSWER: B. Reduction
3. The gain of oxygen atoms is defined as ____
A. Oxidation
B. Reduction
C. Both
D. None
ANSWER: A. Oxidation
4. Burning is an example of ____
A. Oxidation
B. Reduction
C. Both
D. None
ANSWER: A. Oxidation
5. The main component of photographic film is ____
A. AgCl
B. AgF
C. AgC
D. AgBr
ANSWER: D. AgBr
6. The apparent charge on an atom in a molecule is ____
A. Concentration
B. Polarizability
C. Oxidation state
D. All of these
ANSWER: C. Oxidation state
7. Increase in oxidation number is termed as ____
A. Oxidation
B. Reduction
C. Both
D. None
ANSWER: A. Oxidation
8. Decrease in oxidation number is characterized as ___
A. Oxidation
B. Reduction
C. Both
D. None
ANSWER: B. Reduction
9. Oxidation state of an element in a a free state is ___
A. Infinity
B. Zero
C. Any value
D. All the possibilities exist
ANSWER: B. Zero
10. Oxidation state of Na in NaCl is ___
A. +2
B. +6
C. +1
D. -1
ANSWER: C. +1
11. Oxidation number of group 1 metal hydrides is ___
A. +2
B. +6
C. +1
D. -1
ANSWER: D. -1
12. Oxidation state of O in OF2 (Oxygen difluoride) is ___
A. +2
B. +6
C. +1
D. -1
ANSWER: A. +2
13. Oxidizing agents itself gets ___
A. Oxidized
B. Reduced
C. Both
D. None
ANSWER: B .Reduced
14. In NaCl the element Na is ___
A. Oxidizing agent
B. Reducing agent
C. Polarizing agent
D. All of these
ANSWER: B. Reducing agent
15. An electrolyte becomes a conductor in _____ state
A. Aqueous solution
B. Molten
C. Both of these
D. None of these
ANSWER: C. Both of these
16. Electrical energy is used by ____
A. Galvanic cell
B. Dry cell
C. Battery
D. Electrolytic cell
ANSWER: D. Electrolytic cell
17. Cathode is _____ charged
A. Positively
B. Negatively
C. Neutral
D. None
ANSWER: B. Negatively
18. Anode is ____ charged
A. Positively
B. Negatively
C. Neutral
D. None
ANSWER: A: Positively
19. Cations move towards ____
A. Anode
B. Don’t move
C. Cathode
D. All of these
ANSWER: C. Cathode
20. Anions move towards ___
A. Anode
B. Don’t move
C. Cathode
D. All of these
ANSWER: A. Anode
21. Oxidation occurs at ____
A. Cathode
B. Solution
C. Anode
D. None of these
ANSWER: C. Anode
22. Reduction occurs at _____
A. Cathode
B. Solution
C. Anode
D. None of these
ANSWER: A. Cathode
23. Sodium metal is commercially produced by ___
A. Galvanic cell
B. Dry cell
C. Down cell
D. All of these
ANSWER: C. Down cell
24. Sodium Hydroxide is produced by ___
A. Galvanic cell
B. Dry cell
C. Down cell
D. Nelson cell
ANSWER: D. Nelson cell
25. Purification of copper is done by ____
A. Galvanic cell
B. Electrolytic cell
C. Down cell
D. Nelson cell
ANSWER: B. Electrolytic cell
26. Galvanic cell used____ and _____ electrodes
A. Cu, Cr
B. H, Hg
C. Cu, Zn
D. W, Sb
ANSWER: C. Cu, Zn
27. Salt bridge contains which electrolyte ____
A. CCl4
B. CHCl3
C. KCl
D. H2SO4
ANSWER: C. KCl
28. Daniel cell consists of ___ half cells
A. 3
B. 7
C. 9
D. 2
ANSWER: D. 2
29. In dry cell cathode is made of ___
A. Bucky ball
B. Diamond
C. Graphite
D. All of these
ANSWER: C. Graphite
30. Oxidation number of Cu increases from 0 to +2 process is ____
A. Reduction
B. Oxidation
C. Polarization
D. All of these
ANSWER: B. Oxidation
31. Anions are formed by _____
A. Reduction
B. Oxidation
C. Polarization
D. All of these
ANSWER: A. Reduction
32. Gain of hydrogen is termed as ____
A. Reduction
B. Oxidation
C. Polarization
D. All of these
ANSWER: A. Reduction
33. Oxidation state of S in S8 is ___
A. 1
B. 2
C. 3
D. 0
ANSWER: D. 0
34. Oxidation state of CO2 is ____
A. 5
B. 4
C. 3
D. 0
ANSWER: D. 0
35. Oxidation state of Cr in K2Cr2O7 is __
A. -2
B. -6
C. +6
D. +3
ANSWER: C. +6
36. Process to deposit one metal on another is ____
A. Electrolysis
B. Galvanism
C. Electroplating
D. All of these
ANSWER: C. Electroplating
37. Perfect conditions for electroplating include ____
A. High current
B. Low temperature
C. High concentration
D. All of these
ANSWER: D. All of these
38.____ ions are extremely toxic
A. Sulphides
B. Chlorides
C. Cynides
D. None of these
ANSWER: C. Cynides
39. Chemically rust is ____
A. Fe
B. Cr
C. Fe2O3
D. Cr2O7
ANSWER: C. Fe2O3
40. The metal which needs to be protected is made ____
A. Anode
B. Cathode
C. Solution
D. None of these
ANSWER: B. Cathode
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