Question
Chemistry Question on Colloids
The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below :
I. (NaCl)=52,
II. (BaCl2)=0.69,
III. (MgSO4)=0.22
The correct order of the their coagulating power is
A
I > II > III
B
II > I > III
C
III > II > I
D
III > I > II
Answer
III > II > I
Explanation
Solution
There is an inverse relation between the coagulation power and coagulation value. Coagulation is the process of clumping or aggregation of the particles to form a solid or semi solid mass. So, according to the question the coagulation value of the substances are:
I. NaCl= 52
II. BaCl2= 0.69
III. MgSO4= 0.22
Therefore, the coagulating power is in the order III> II> I