`0.025` gm of starch solution is required to prevent coagulation of 10 ml gold sol. When 1 ml of
`10% NaCl` Solution is present. What is the gold number of starch sol?

Options

A. 25
B. `2.5`
C. `0.25`
D. `0.025`

Answer

A

Explanation

Gold number of lyophillic sol added in Mg in 10 ml gold sol with 1 ml of 10% NaCl to prevent cagulation.
`=0.025 g`
`0.025xx1000=25 Mg`