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Q.

The coagulation of 10 cm3 of Gold sol by 1 ml 10 % NaCI solution is completely prevented by addition of 0.025 g of starch to it. The gold number of starch is

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a

0.025

b

0.25

c

2.5

d

25

answer is D.

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Detailed Solution

0.25 g starch add in 10 cm3 gold sol∴ 10 cm3 gold sol contain = 0.25 g1 cm3 gold sol contain =0.25×10−3mg10=25
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