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