Test tasks

 

 

1. The process of splitting of the molecules into ions of an electrolyte is called …
A. Ionization
B. Electrolysis
C. Salvation
D. Protonation
2. The color of the electrolytes in solution is due to is …
A. ions
B. salvation
C. electrolysis
D. dissolution
3. Degree of ionization does not depend upon …
A. temperature
B. pressure
C. concentration
D. nature of solvent
4. Colour of CuSO4 solution is …
A. green
B. yellow
C. blue
D. red
5. Calculate the value of Kw for water in 0.100 M NaCl solution. The experimental value is 1.65 × 10-14.
A. 1.61 × 10-14
B. 1.65 × 10-14
C. 4.01 × 10-5
D. 4.01 × 10-8
E. 7.62 × 10-8
6. If a solution has a pH of …
A. Basic
B. Acidic
C. Neutral
D. No right answer
7. A strong electrolyte is a substance that … dissociates in water.
A. Slightly
B. Never
C. Completely
D. Absent
8. A solution that has a high ionic concentration and allows an electrical current to pass through is called ...
A. Non-electrolyte
B. Weak electrolyte
C. Strong electrolyte
D. Strong non-electrolyte
9. A substance that when dissolved in water allows an electrical current to flow through it …
A. Solution
B. Electrochemistry
C. Non-electrolyte
D. Electrolyte
10. Which of the following is a non-electrolyte?
A. Mg(OH)2
B. H2SO4
C. P2S3
D. CaCl2
11. Identify the incorrect statement:
A. As the pH increases the hydroxide ion decreases
B. As the pH increases the hydronium ion concentration decreases
C. As the pH increases the Kw of water remains the same
D. As the pH increases the solution becomes less acidic and more alkaline
E. As the pH increases the product [H3O+][OH-] remains constant
12. Which one of the followings is an electrolyte?
A. Sodium nitrate solution
B. Sugar
C. Sulfur
D. Magnesuim oxide
13. Blue litmus paper changes to red if the solution is …
A. Basic
B. Acidic
C. Neutral
D. No right answer
14. Which of the following is a weak electrolyte?
A. HBr
B. O2
C. HNO3
D. H2CO3
15. Which one of the followings is an non electrolyte?
A. Sodium hydroxide solution
B. Sugar
C. Hydrochloric acid
D. Magnesium chloride
16. What is the pH and pOH of a 1.2 × 10-3 HBr solution?
A. pH= 2,9 ; pOH=11,1
B. pH= 3,9 ; pOH=1,1
C. pH= 2,9 ; pOH=16,1
D. pH= 5,9 ; pOH=11,8
17. Which one is a non electrolyte?
A. H2SO3
B. H2SO4
C. NaOH
D. CH3OH
18. If 4,5 moles of HCl are dissolved in 1 liter of water, what is the concentration of the H+ ion?
A. 5,5 M
B. 4,5 M
C. 2 M
D. 2,25 M
19. The larger the Ka value, the …
A. Larger the degree of dissociation
B. Smaller the degree of dissociation
C. Degree of dissociation stays the same
D. No right answer
20. If solution has a pH of ˃ 7, it is …
A. Basic
B. Acidic
C. Neutral
D. No right answer