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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 0.25g of strach, the coagulation is just prevented. Strach has the following gold number

A

`0.025`

B

`0.25`

C

`2.5`

D

25

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The correct Answer is:
D
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