MolSynapsequestion bank

MolSynapse / Question bank / Surface Chemistry / Colloids: classification and preparation

JEE Main levelSingle correct optionDifficulty 2 of 3sc124

When a few drops of concentrated $FeCl X_{3}$ solution are added to boiling water, a reddish-brown sol is formed. This preparation is an example of

Apeptization, a dispersion method
Bdouble decomposition, a dispersion method
Celectrical disintegration, a condensation method
Dhydrolysis, a condensation method

Answer: D

FeCl X_{3}

reacts with hot water to form

Fe (OH) X_{3}

:

FeCl X_{3} + 3 H X_{2} O Fe (OH) X_{3} + 3 HCl

. The molecular-sized product aggregates to colloidal particles, so particles are built up, not broken down. This is a condensation method based on hydrolysis.

Practice Surface Chemistry More on Colloids: classification and preparation

Previous questionNext question

More questions on Colloids: classification and preparation