Which of the following will coagulate starch | vedclass

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(B) Starch sol is a lyophilic colloid. Lyophilic colloids are stabilized by two factors: charge and solvation (hydration). To coagulate a lyophilic so

Vedclass · Accepted Answer

$C_2H_5OH$

Vedclass · Answer

(B) Starch sol is a lyophilic colloid. Lyophilic colloids are stabilized by two factors: charge and solvation (hydration). To coagulate a lyophilic sol,both factors must be removed. Adding an electrolyte (like $NaCl$,$BaCl_2$,or $CaSO_4$) only neutralizes the charge but does not remove the solvation layer. However,adding a dehydrating agent like an alcohol (e.g.,$C_2H_5OH$) removes the solvation layer,leading to coagulation. Therefore,$C_2H_5OH$ is effective in coagulating starch sol.

Which of the following will coagulate starch sol?

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