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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

`0.025`

B

`0.25`

C

`2.5`

D

`25`

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