A) 50
B) 40
C) 30
D) None of these
Correct Answer: A
Solution :
Coagulation value is the millimoles of an electrolyte that must be added to 1 L of a colloidal solution for complete coagulation. \[\therefore \] 5 mL of 1 M \[NaCl=\frac{1}{1000}\times 5\] \[=0.005\,\]or\[~5\text{ }mmol.\] 100 mL of a colloidal solution require NaCI for complete coagulation \[=\text{ }5\text{ }mmol\] \[\therefore \]1 L of colloidal solution require \[NaCl\] for complete coagulation \[=50\text{ }mmol\] \[\therefore \] Coagulation value of \[NaCl=50\]
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