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Consider the following statements regarding clay particles.
1. The clay particles carry a net negative charge.
2. The cation concentration increases with the distance from the surface of the particle.
3. When the spacing between the two clay particles is very small, the force of attraction is greater than the force of repulsion.
The correct statements are:
  • a)
    1 and 2 only
  • b)
    2 and 3 only 
  • c)
    1 and 3 only
  • d)
    1, 2 and 3
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following statements regarding clay particles.1. The clay...
The clay particles carry a net negative charge on their surfaces. This is the result both of isomorphous substitution and of a break in continuity of the structure at its edges. In dry clay, the negative charge is balanced by exchangeable cations like Ca2+, Mg2+, Na+, and K+ surrounding the particles being held by electrostatic attraction. When water is added to clay, these cations and a few anions float around the clay particles. This configuration is referred to as a diffuse double layer.

The cation concentration decreases with the distance from the surface of the particle. The force of attraction between water and clay decreases with distance from the surface of the particles.

When two clay particles in suspension come close to each other, the tendency for interpenetration of the diffuse double layers results in repulsion between the particles. At the same time, an attractive force exists between the clay particles that is caused by van der Waals forces and is independent of the characteristics of water. Both repulsive and attractive forces increase with decreasing distance between the particles, but at different rates. When the spacing between the particles is very small, the force of attraction is greater than the force of repulsion.
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Most Upvoted Answer
Consider the following statements regarding clay particles.1. The clay...
1. Net Negative Charge:
- Clay particles carry a net negative charge due to isomorphic substitution of cations by anions in their crystal lattice. This negative charge leads to the adsorption of cations on the surface of the clay particles.

2. Cation Concentration Gradient:
- The cation concentration increases with the distance from the surface of the clay particle. This is known as the diffuse double layer phenomenon, where cations form a layer around the clay particle due to electrostatic forces.

3. Force of Attraction vs. Repulsion:
- When the spacing between two clay particles is very small, the force of attraction between them is greater than the force of repulsion. This is because the cations in the diffuse double layer of one particle are attracted to the negatively charged surface of the other particle, leading to flocculation.
Therefore, the correct statements are 1 and 3 only. Clay particles carry a net negative charge and when the spacing between particles is small, the force of attraction is greater than the force of repulsion due to cation bridging.
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Consider the following statements regarding clay particles.1. The clay particles carry a netnegative charge.2. The cation concentration increases with the distance from the surface of the particle.3. When the spacing between the two clay particles is very small, the force of attraction is greater than the force of repulsion.The correct statements are:a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?
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Consider the following statements regarding clay particles.1. The clay particles carry a netnegative charge.2. The cation concentration increases with the distance from the surface of the particle.3. When the spacing between the two clay particles is very small, the force of attraction is greater than the force of repulsion.The correct statements are:a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Consider the following statements regarding clay particles.1. The clay particles carry a netnegative charge.2. The cation concentration increases with the distance from the surface of the particle.3. When the spacing between the two clay particles is very small, the force of attraction is greater than the force of repulsion.The correct statements are:a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements regarding clay particles.1. The clay particles carry a netnegative charge.2. The cation concentration increases with the distance from the surface of the particle.3. When the spacing between the two clay particles is very small, the force of attraction is greater than the force of repulsion.The correct statements are:a)1 and 2 onlyb)2 and 3 onlyc)1 and 3 onlyd)1, 2 and 3Correct answer is option 'C'. Can you explain this answer?.
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