1. The equation representing the process by which standard reduction potential of zinc can be defined is
   
   1. Zn²⁺ (S) + 2e^– ——> Zn
   2. Zn (g) ——> Zn²⁺ (g) + 2e^–
   3. Zn²⁺ (g) + 2e^– ——> Zn
   4. Zn²⁺ (aq.) + 2e^– ——> Zn (S)
      
      
2. The cell emf depends on
   
   1. Size of anode
   2. Volume of solution
   3. Temperature
   4. All of them
      
      
3. Emf of a cell in terms of the reduction potential of its left and right electrodes is
   
   1. E = E_Left – E_Right
   2. E = E_Left + E_Right
   3. E = E_Right – E_Left
   4. E = E_Right + E_Left
      
      
4. E^O values of Mg²⁺ | Mg, Fe²⁺| Fe and Zn²⁺ | Zn are -2.37V, -0.44V and -0.76V respectively. The correct statement is
   
   1. Mg oxidises Fe
   2. Zn oxidises Fe
   3. Zn reduces Mg²⁺
   4. Zn reduces Fe²⁺
      
      
5. Which one of the following is the wrong statement about electrochemical series?
   
   1. Active Metals have a negative reduction potential
   2. Active non-metals have positive reduction potentials
   3. Metals above hydrogen liberate hydrogen from acids
   4. Metals below hydrogen are strong reducing agents
      
      
6. Strongest Reducing agent is
   
   1. K
   2. Mg
   3. Al
   4. I
      
      
7. The standard reduction potential at 25°C for the following half-reaction are given against each
   Zn²⁺ (aq) + 2e^– ——> Zn(s), – 0.762
   Cr³⁺ (aq) + 3e^– ——> Cr(s), – 0.740
   2H⁺ + 2e^– ——> H₂ (g), 0.00
   Fe³⁺ + 2e^– ——> Fe²⁺, – 0.77
   Which is the strongest reducing agent?
   
   1. Zn
   2. Cr
   3. H₂ (g)
   4. Fe²⁺ (aq)
      
      
8. Red hot carbon will remove oxygen from the oxide XO and YO but not from ZO. Y will remove oxygen from XO. Use this evidence to deduce the order of activity of the three metals X, Y and Z putting the most active first
   
   1. XYZ
   2. ZYX
   3. YXZ
   4. ZXY
      
      
9. Which of the following metals does not give the following reaction?
   M + water ——–> oxide or hydroxide + H₂
   
   1. Iron
   2. Sodium
   3. Mercury
   4. Magnesium
      
      
10. Which is the best reducing agent?
    
    1. F^-1
    2. Cl^-1
    3. Br^-1
    4. I
       
       
11. If a spoon of copper metal is placed in a solution of ferrous sulphate
    
    1. Cu will precipitate out
    2. Iron will precipitate
    3. Cu and Fe will precipitate
    4. No reaction will take place
       
       
12. Which one will liberate Br₂ from KBr
    
    1. HI
    2. I₂
    3. Cl₂
    4. SO₂
       
       
13. Using the standard electrode potential values given below, decide which of the statements I, II, III, IV are correct. Choose the right answer
    Fe²⁺ + 2e^– Fe(s); E^O = -0.44 V
    Cu²⁺ + 2e^– Cu(s); E^O = +0.34 V
    Ag⁺ + e^– Ag(s); E^O = +0.80 V
    I. Copper can displace from FeSO₄ solution.
    II. Iron can displace copper from CuSO₄ solution
    III. Silver can displace copper from CuSO₄ solution
    IV. Iron can displace silver from AgNO₃ solution
    
    1. I and II
    2. II and III
    3. II and IV
    4. I and IV
       
       
14. The standard electrode potential value of the elements A, B and C are 0.68, -2.50 and 0.50 V respectively. The order of their reducing power is
    
    1. A > B > C
    2. A > C > B
    3. C > B > A
    4. B > C > A
       
       
15. Zn can not displace following irons from their aqueous solution
    
    1. Ag⁺
    2. Cu²⁺
    3. Fe²⁺
    4. Na⁺
       
       
16. When a piece of sodium metal is dropped in the water a reaction takes to yield hydrogen because
    
    1. Sodium loses electrons
    2. Sodium acts as an oxidising agent
    3. Water loses electrons
    4. Water acts as a reducing agent
       
       
17. The reduction potential values are given below:
    Al³⁺ / Al = 1.67 volt
    Mg²⁺ / Mg = -2.34 volt
    Cu²⁺ / Cu = +0.34 volt
    I₂ / 2I^– = +0.53 volt
    Which one is the best reducing agent:
    
    1. Al
    2. Mg
    3. Cu
    4. I₂
       
       
18. From the values given below:
    Al³⁺ / Al = 1.67 volt
    Mg²⁺ / Mg = -2.34 volt
    Cu²⁺ / Cu = +0.34 volt
    I₂ / 2I^– = +0.53 volt
    Which one is the best oxidising agent:
    
    1. Al
    2. Mg
    3. I₂
    4. Cu
       
       
19. The standard electrode potential of four elements A, B, C and D are -3.05, 1.66, -0.40 and 0.80 volts. The highest chemical activity will be shown by
    
    1. A
    2. B
    3. C
    4. D
       
       
20. The standard reduction potential at 25°C of Li⁺/Li, Ba²⁺/Ba, Na⁺/Na and Mg²⁺/Mg are -3.05, -2.73, -2.71 and 2.37 volt respectively. Which one of the following is the strongest oxidising agent
    
    1. Na⁺
    2. Li⁺
    3. Ba²⁺
    4. Mg²⁺

Answers:

1. 4
2. 3
3. 3
4. 4
5. 4
6. 1
7. 4
8. 2
9. 3
10. 4
11. 4
12. 3
13. 3
14. 4
15. 4
16. 1
17. 2
18. 3
19. 1
20. 4