71. Which mixture is heterogeneous?
A) Solution
B) Suspension
C) Alloy
D) Air
Answer: B
72. Which has particles larger than 1000 nm?
A) Solution
B) Colloid
C) Suspension
D) Gas
Answer: C
73. Which one is a clear mixture?
A) Suspension
B) Solution
C) Mud
D) Soil
Answer: B
74. Which of the following cannot be seen with naked eye?
A) Suspension
B) Solution
C) Sand
D) Dust
Answer: B
75. Which property increases solubility of solids?
A) Decreasing temperature
B) Increasing temperature
C) Decreasing pressure
D) None
Answer: B
76. Which solution is unstable?
A) Solution
B) Suspension
C) Alloy
D) Gas
Answer: B
77. Which mixture shows scattering of light?
A) Solution
B) Colloid
C) Pure water
D) Alcohol
Answer: B
78. Which of the following is homogeneous?
A) Sand in water
B) Salt in water
C) Mud
D) Oil in water
Answer: B
79. Which of the following is an example of suspension?
A) Milk
B) Sugar solution
C) Dust in air
D) Air
Answer: C
80. Which process involves settling of particles?
A) Filtration
B) Sedimentation
C) Distillation
D) Sublimation
Answer: B