What is a gold sol and gold number? 

Gold number is:

Define Gold number.

Which out of gold sol and gelatin in water sol is a lyophilic sol?

What is the ratio of mass of a gold atom and an alpha -particle ?

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

Gold number gives

On addition of 1 mL solution of 10% NaCl to 10 mL gold sol in the presence of 0.0250 g of starch, the coagulation is just prevented. What is the gold number of starch?

On addition of 2mL of 5% NaCl to 10 mL gold sol in the presence of 0.025 g starch , the coagulation is just prevented. What is the gold number of starch ?

What are protective colloids ? Define and explain gold number .

What is meant by Gold number of starch is 10-15?