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The coagulation of 10cm^(3) of gold sol ...

The coagulation of `10cm^(3)` of gold sol by `1 ml 10% NaCl` solution is completely prevented by addition of `0.025g` of starch to it. The gold number of starch is

A

`0.025`

B

`0.25`

C

`2.5`

D

`25`

Text Solution

Verified by Experts

The correct Answer is:
D
`0.25 g ` starch add in `10cm^(3)` gold sol
`:. 10 cm^(3)` "gold sol contain" = `0.25g`
`1 cm^(3)` gold sol contain = `(0.25xx10^(-3)mg)/(10) = 25`.
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