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Question

104 of gelatin is required to be added to 100 cm3 of a standard gold solution to just prevent its precipitation by the addition of 1 mL of 10% of NaCl solution to it. Hence the gold number of gelatin in is?

A
10
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B
1.0
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C
0.1
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D
0.01
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E
0.001
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Solution

The correct option is B 0.01
Solution:- (D) 0.01
As we know that, gold number is the number of milligrams of dry protective colloids required to just prevent the coagulation of 10mL of red gold sol when 1mL of 10%NaCl added to it.
Therefore,
Amount of gelatin required to protect 10mL of gold solution =104×10100=105g=102mg=0.01mg

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