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Gels on standing exude small amounts of ...

Gels on standing exude small amounts of liquid. The phe-nomena is known as

A

Imbibitions

B

syneresis

C

thixotropy

D

swelling

Text Solution

Verified by Experts

The correct Answer is:
B
Gels exhibit the phenomenon of syneresis, of exuding small amounts of liquid on standing. At the same time the gel contracts.
Thixotroy is the isothermal gel sol transformation brought about by shaking or other mechanical means. It may be regarded as a packing phenomenon. For example, `Fe(OH)_(3)` gels on shaking form sols which rapidly set again when allowed to stand.
Elastic gels exhicit the phenomenon of imbibition or swelling. When placed in a suitable liquid such as water, an elastic gel is able to imbibe (absorb) considerable volumes of the liquid, often several times as large as the volume of the original gel.
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