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Question

The gold number of four protective colloids a, b, c and d are 0.1,0.25,5and 15 respectively. the maximum protecting power is of


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Solution

Gold number of colloids

  • The gold number is defined as the minimum amount of protective colloid in mg required to avoid coagulation of 10ml of a particular gold solution when 1ml of a 10% Sodium chloride solution is added to it.
  • Because a greater amount of colloid is required to avoid coagulation, the higher the gold number, the lesser the colloid's protective power.

Maximum protecting power

  • The value of the gold number is highest for the d colloid.
  • So, the protecting power is lowest for d colloid.
  • The value of the gold number is the lowest for colloid a.
  • So, the protective power is maximum for colloid a.

Hence, the maximum protecting power is of colloid a.


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