Question

Assertion: Thixotropy and syneresis are two distinct properties of gels.
Reason: In both the two properties, thixotropy and syneresis of gels, internal liquid comes out.
A.Both Assertion and reason are correct and reason is the correct explanation for assertion
B. Both assertion and reason are correct with reason is not the correct explanation for assertion.
C.Assertion is correct but reason is incorrect
D.Assertion is incorrect, reason is correct.

Answer 1

Hint: Thixotropy and the syneresis are the outcome of liquids from the gels. They are the two different properties of gel. One of them leads to the change in physical structure of gel and the other one keeps the structure intact.

Complete step by step answer:
Gels are the semi solids that have both the properties such as soft and weak like liquid and hard and strong like a solid. Property exhibited by the gel is due to the cross linked system. Due to this crosslink system the gels do not have the following property in the steady state. Gelatin is the process of formation of gels.
Gels show the property of thixotropy, this property states that gels become fluids when shaken or agitated but they again become solid when we place them at rest.
Syneresis is the outcome or out flow of internal liquid of the gel without disturbing the structure of the gel.
Hence, the assertion that thixotropy and syneresis are two distinct properties of gel is correct but the reason that they in both of them internal liquid comes out is wrong because it does not help in distinguishing the properties.

Hence, the correct option is B.

Note:
There are various types of gels such as hydrogel which contains water as a dispersion medium in a colloidal gel and are hydrophilic in nature. Organogels as the name suggest are non crystalline and they are composed of liquid organic phase trapped in a three-dimensional cross linking. Xerogel is formed by drying the solid or shrinking the solids. Aerogel is highly porous and has very small pores sizes. Nanocomposite hydrogels contain the polymeric networks made by covalent cross linking.