Question

From the given following sol, how many can coagulate the haemoglobin sol?
$Fe(OH{)}_3,Ca(OH{)}_2,Al(OH{)}_3,$ starch, clay, $A{s}_2{S}_3,CdS,$ basic dye

• A. $1$
• B. $3$
• C. $4$
• D. $8$

Answer 1

The correct option is C $4$

Haemoglobin is positively charged colloid.
It will be coagulated by negatively charged colloids.
These include $A{s}_2{S}_3$, starch,clay and basic dye.
Thus four sols can coagulate the haemoglobin sol.