Structures in Clay Minerals – MCQ

1. The clayey soil is formed by the chemical weathering of

2. The kaolinite mineral is formed by the breakdown of

a) Feldspar
b) Chlorite
c) Amorphous
d) None of these

3. Which of the following statement is true

a) Clay mineral is the colloidal size (<0.002 mm)
b) Clay mineral having a high specific surface
c) Clay minerals are of the flaky form
d) All of these

4. What is the chemical composition of kaolinite?

a) Al₄Si₄ O₁₀(OH)₈ .4H₂O
b) Al₄Si₈ O₂₀(OH)₈ .nH₂O
c) Al₄Si₄O₁₀(OH)₈
d) Al₂Si₄O₁₀(OH)₂

5. What is the chemical composition of Illite?

a) KAl₄ AlSi₇ O₂₀(OH)₄
b) Al₄Si₈ O₂₀(OH)₈ .nH₂O
c) Al₄Si₄ O₁₀(OH)₈ .4H₂O
d) Al₂Si₄O₁₀(OH)₂

6. Most of the clay minerals consist of a

a) Silica tetrahedron
b) Silica octahedron
c) Alumina tetrahedron
d) None of these

7. The reaction by which silicon and aluminium are partially replaced by other elements is known as.

a) Isomorphous substitution
b) Isomorphic substitution
c) Isotropic Interchange
d) None

8. A tetrahedron has __ numbers of faces.

a) 2
b) 4
c) 6
d) 8

9. In case of kaolinite, clay mineral particle., The thickness of each stack of silica and alumina is about.

a) 3 A⁰
b) 5 A⁰
c) 7 A⁰
d) 9 A⁰

10. The hydrogen bond of kaolinite clay minerals is —– than the potassium bond of illite clay minerals.

a) Stronger
b) Weaker

• Soil Engineering - MCQ