To coagulate 100 ml of a colloid, 1 litre of `0.03N` `MgCl_2` is required. Then, The flocculation value of `MgCl_2` is

Options

A. `150.`
B. `300.`
C. `100.`
D. `600.`

Answer

A

Explanation

Flocculation value is defined as the minimum concentration (in millimoles per litre) of an electrolyte required to cause the caogulation power of an electrolyte is usually expressed in thems of its flocculation value.
Gram equivalents of `MgCl_2`
`="Normality" xx "volume"`
`=0.03 xx 1=0,03`
`"Normality"= "molarity" xx "n.factor"`
`"molarity"="Normality"/"n.factor"=0.03/2=0.015`
100 mL of colloid requires 15 millimoles then one liter (1000 ml) requires
`(15 xx 1000)/100=150` millimoles.
So, flocculation value=150