`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?
A
`2.5`
B
25
C
`0.25`
D
250
Text Solution
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The correct Answer is:
2
Gold no. `=` amount of protective colloid in mg to be added to `10ml` of gold sol to prevent its coagulation on add of `1 ml` of `10% NaCl` solution of Gold no. `=0.0250xx1000=25`
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