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CMC Medical CMC-Medical VELLORE Solved Paper-2011

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

    A)  25     

    B)                         0.025

    C)  0.25                                      

    D)  2.5

    E)  0.0025

    Correct Answer: A

    Solution :

                    Gold number of protective colloid is defined as the amount of Colloid in milligrams which when added to 10 mL of gold solution just prevents its coagulation by 1 mL of 10% \[NaCl\] solution. Protective power \[\propto \]\[\frac{\text{1}}{\text{gold}\,\text{number}}\] \[0.025g=25mg\] Thus, the gold number of starch is 25.


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