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  3. CEE Kerala Engineering

CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2007

  • question_answer
    On adding one mL of solution of\[10%\text{ }NaCl\]to 10 mL of gold sol in the presence of 0.25 g of starch, the coagulation is just prevented. The gold number of starch is

    A)  0.25                      

    B)         0.025

    C)  2.5                        

    D)         25

    E)  250

    Correct Answer: E

    Solution :

    Gold number is the number of milligrams of a hydrophilic colloid that will just prevent the coagulation of 10 mL of a gold sol on addition of 1 mL of 10%\[NaCl\]solution. \[\therefore \] Gold number \[=0.25\times 1000=250\]


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