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Surface Chemistry — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistrySurface Chemistry1 Mark
Question
Define gold number.
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Answer

The number of milligram of a protective colloid which protect 10 mL of a gold sol (containing .06 gram gold per litre) from coagulation on the addition of 1 mL 10% sodium chloride solution.

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