21. Electrical conductivity in electrolytes is due to the movement of:

• A) Electrons only
• B) Protons only
• C) Ions
• D) Neutrons
• Answer: C

22. The degree of dissociation of a weak electrolyte is:

• A) Proportional to its concentration
• B) Inversely proportional to its dilution
• C) Proportional to its dilution
• D) Not affected by dilution
• Answer: C

23. Which of the following is a strong electrolyte?

• A) Acetic acid
• B) Sodium chloride
• C) Ammonia
• D) Ethanol
• Answer: B

24. The conductivity of an electrolyte solution depends on:

• A) The concentration of the electrolyte
• B) The mobility of ions
• C) The temperature of the solution
• D) All of the above
• Answer: D

25. Which of the following materials is an insulator?

• A) Silver
• B) Rubber
• C) Copper
• D) Gold
• Answer: B

26. In Arrhenius theory, a base increases the concentration of which ion in water?

• A) OH⁻
• B) H⁺
• C) Cl⁻
• D) Na⁺
• Answer: A

27. Ostwald’s dilution law is applicable to:

• A) Strong electrolytes
• B) Weak electrolytes
• C) Both strong and weak electrolytes
• D) Non-electrolytes
• Answer: B

28. The conductance of an electrolyte is defined as:

• A) The ability of a substance to allow the flow of electrons
• B) The ability of an electrolyte to conduct electricity
• C) The resistance of an electrolyte to electric current
• D) The dissociation constant of the electrolyte
• Answer: B

29. Which of the following statements is true about the Arrhenius definition of acids and bases?

• A) It applies to all solvents
• B) It is only valid in aqueous solutions
• C) It applies to non-electrolyte solutions
• D) It includes the concept of conjugate acids and bases
• Answer: B

30. What is the effect of temperature on the conductivity of a metal conductor?

• A) Increases conductivity
• B) Decreases conductivity
• C) Has no effect
• D) Converts it to an insulator
• Answer: B