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CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2004

  • question_answer
    On addition of 1 mL solution of\[10%\text{ }NaCl\]to 10 mL gold solution in the presence of 0.025 g of starch, the coagulation is prevented because starch has the following gold numbers:

    A)  25                                         

    B)  0.025

    C)  0.25                      

    D)         2.5

    E)  0.0025

    Correct Answer: A

    Solution :

    Gold number of protective colloid is: Colloid in milligrams which when added to 10 mL of gold solution just prevents its coagulation by 1 mL of\[10%\text{ }NaCl\]solution. Protective power \[\propto \,\frac{1}{gold\,number}\] The gold number of starch is 25, because it as very low protective power.


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