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Q.

400ml of standard gold sol is just prevented from coagulation by the addition of 0.96gm of starch before adding 1ml of 10% NaCl solution, the gold number will be

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a

2.4

b

240

c

24

d

7.6

answer is D.

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Detailed Solution

detailed_solution_thumbnail

400ml of gold sol required starch = 0.96g = 960mg
10ml of gold sol required starch = ?
$\frac{960 \times 10}{400} = 24$

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