41. Which material is used in electrical wiring due to its high conductivity?

• A) Iron
• B) Copper
• C) Zinc
• D) Plastic
• Answer: B

42. The degree of dissociation of a weak acid is:

• A) Directly proportional to its concentration
• B) Inversely proportional to its concentration
• C) Directly proportional to its dilution
• D) Independent of its concentration
• Answer: C

43. Ostwald’s dilution law states that for a weak electrolyte:

• A) Conductivity decreases with concentration
• B) Conductivity increases with concentration
• C) Degree of dissociation decreases with dilution
• D) Degree of dissociation increases with dilution
• Answer: D

44. What happens to the conductivity of a solution as temperature increases?

• A) Conductivity decreases
• B) Conductivity remains unchanged
• C) Conductivity increases
• D) Conductivity fluctuates
• Answer: C

45. Which of the following is an insulator?

• A) Aluminum
• B) Water
• C) Rubber
• D) Copper
• Answer: C

46. The strength of an acid according to the Arrhenius theory is measured by:

• A) Its pH value
• B) Its ability to donate electrons
• C) Its ability to accept protons
• D) Its dissociation in water
• Answer: D

47. Electrical conductors allow electricity to pass through them due to:

• A) Free electrons
• B) Free neutrons
• C) Free protons
• D) Free ions
• Answer: A

48. Which of the following is a characteristic of strong electrolytes?

• A) Low degree of dissociation
• B) Complete dissociation in water
• C) Poor electrical conductivity
• D) No dissociation in water
• Answer: B

49. What is the effect of dilution on weak electrolytes according to Ostwald’s law?

• A) Degree of dissociation decreases
• B) Degree of dissociation increases
• C) Degree of dissociation remains constant
• D) Degree of dissociation becomes zero
• Answer: B

50. Which factor has no effect on the conductivity of a metal?

• A) Temperature
• B) Number of free electrons
• C) Pressure
• D) Impurities
• Answer: C