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On addition of 1 mL solution of 10% NaCl...

On addition of `1 mL` solution of `10% NaCl` to `10 mL` gold sol in the presence of `0.0250 g` of starch, the coagulation is just prevented. What is the gold number of starch?

A

25

B

`2.5`

C

`0.25`

D

`0.025`

Text Solution

Verified by Experts

The correct Answer is:
A
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`
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