Which of the following is not exhibited by sols?a)Flocculationb)Tyndall effectc)Paramagnetismd)AbsorptionCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

As the molecules remain only at the surface and do not go deeper into the bulk of the solid, the concentration of adsorbed gas or liquid is more at the surface than in the bulk. 'Adsorption is a technical term coined to denote the taking up of gas, vapour, liquid by a surface or interface.

Tyndall effect - If a homogeneous solution is observed in the direction of light, it appears clear and when it is observed from a direction at right angles to the direction of the light beam, it appears perfectly dark. But when a beam of light passes through colloidal solutions, it is scattered, the maximum scattered intensity being in the plane at right angles to the path of light. The path beam becomes visible. The effect was first observed by Faraday but was studied in detail by Tyndall and the effect is not commonly known as Tyndall effect.

Flocculation is a process in which colloids come out of suspension in the form of floc or flake, either spontaneously or due to the addition of a clarifying agent.

Paramagnetism is a form of magnetism whereby certain materials are attracted by an externally applied magnetic field and form internal induced magnetic fields in the direction of the applied magnetic field and it is not shown by solutions

Answer

Paramagnetism

Answer

Flocculation:
Flocculation refers to the process in which fine particles in a sol come together to form larger aggregates or flocs. This process occurs when the repulsive forces between the particles are overcome by attractive forces, leading to the formation of clusters. Flocculation is exhibited by sols.

Tyndall Effect:
The Tyndall effect is the scattering of light by colloidal particles in a sol or suspension. When a beam of light passes through a sol, the particles scatter the light, making the path of the beam visible. This effect is not observed in true solutions but is characteristic of colloidal systems. Therefore, the Tyndall effect is exhibited by sols.

Paramagnetism:
Paramagnetism is the property of a substance to be weakly attracted by a magnetic field. Paramagnetic substances have unpaired electrons, which align with the external magnetic field, causing a weak attraction. However, sols are typically composed of non-magnetic materials, and hence they do not exhibit paramagnetism.

Absorption:
Absorption refers to the process in which one substance is taken up by another substance. In the context of sols, absorption can occur when the particles in the sol interact with the solvent molecules, resulting in the solute being absorbed or dissolved in the solvent. Therefore, sols can exhibit absorption.

Conclusion:
Among the given options, the property that is not exhibited by sols is paramagnetism. Sols are colloidal systems composed of non-magnetic materials, so they do not show any significant magnetic properties.

Top Courses for Class 12

Suggested Free Tests

Related Content

Schools

Competitive Examinations

Quick Access Links

Technical Exams