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On addition of 1 ml of solution of 10% N...

On addition of 1 ml of solution of 10% NaCl to 100ml corporate gold sol in presence of 0.25g of starch, the coagulation is just prevented. The gold number of starch is

A

`0.025`

B

`0.25`

C

2.5

D

25

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The correct Answer is:
D
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