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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    The coagulation of 100 mL of a colloidal solution of gold is completely prevented by the addition of 0.25 g of starch to it before adding 1 mL of 10% \[NaCl\] solution. What is the gold number of starch?

    A)  5                                            

    B)  10

    C)  30                                         

    D)  25

    E)  None of these

    Correct Answer: D

    Solution :

                    Amount of starch added to 100 mL of gold  to prevent coagulation of 1 mL of 10% \[NaCl\] solution = 0.25 g = 250 mg Starch required to be added to 10 mL of gold sol to completely prevent coagulation by 1 mL of 10% NaCl solution \[=\frac{250}{100}\times 10\] \[=25\,mg\] \[\therefore \] Gold number of starch = 25


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