During peptization the

A. precipitate breaks up into smaller particles of the size of a colloid

B. molecules aggregate to form a colloid

C. the precipitate absorb one of the ions of the electrolyte on its surface

D. precipitate is shaken with the dispersion medium

E. molecules loses positive and negative charge.

Choose the correct answer from the options given below:

A, C and D only

The correct answer is option 4. A, C and D only. 

Peptization: This is a process where a precipitate, which is a solid formed from a chemical reaction in a solution, is broken down into smaller particles to form a colloid. Colloids are mixtures in which one substance is evenly dispersed throughout another. Peptization typically involves adding a dispersing agent or shaking the precipitate with the dispersion medium (the liquid in which the colloid is formed).

A. Precipitate breaks up into smaller particles of the size of a colloid: This is true. Peptization involves breaking down the larger solid particles of the precipitate into smaller ones, often colloidal in size.

B. Molecules aggregate to form a colloid: This is not correct. Peptization involves breaking down aggregates or clumps of particles into smaller particles, not forming aggregates.

C. The precipitate absorbs one of the ions of the electrolyte on its surface: This is true. During peptization, the dispersing agent or the ions from the dispersion medium are absorbed onto the surface of the precipitate particles, helping to stabilize the colloid.

D. Precipitate is shaken with the dispersion medium: This is true. Shaking the precipitate with the dispersion medium helps break it down into smaller particles, facilitating the formation of a colloid.

E. Molecules lose positive and negative charge: This is not typically associated with peptization. Peptization is primarily about dispersing a precipitate into smaller particles, not about changing the charge of molecules.

So, the correct answer is option 4: A, C, and D only.