Explain the following:
Gold number

Gold number is:

Define Gold number.

on addition of 1 ml solution of 10% NaCl to 10 ml gold sol in the presence of 0.25g of strach, the coagulation is just prevented. Strach has the following gold number

Explain the following (i) Excess of carbon is added to zinc metallurgy. (ii) In the elctrolysis of alumina, cryolite is added to alumina. (iii) Coke does not cause reduction of Al_(2)O_(3) . (iv) Gold is soluble in aquaregia, silver is not.

Which of the following has minimum gold number ?

Collidal dispersion have been classified into different types depending upon the physical state of the dispersed phases and the dispersion medium. They are prepared in the industry or in the laboratory by a number of methods and then purified. The protective action of lyophilic colloids was studied by Zsigmondy and he introduced a term called gold number. Which of the following has minimum gold number?

Gold number gives

Classify the following into pure substances and mixture. Gold.

0.02 g of gelatin is required to protect 10 mL of gold sol from 10% NaCl , then find the gold number for gelatin. Report your answer by multiplying by 100.