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JEE Main & Advanced JEE Main Paper (Held On 19 May 2012)

  • question_answer
    On addition of 1 mL of 10% NaCl solution to 10 mL gold sol in the presence of 0.025 g of starch, the coagulation is just prevented. Starch has gold number     JEE Main  Online Paper (Held On 19  May  2012)

    A) 2.5                         

    B)                        25

    C)                        0.25                                       

    D)                        0.025

    Correct Answer: B

    Solution :

                    Gold Number is the minimum amount of lyophiliccolloide in miligrams (starch in given case) which prevents the flocculation of 10 ml gold sol by the addition of 1ml of 10% NaCI solution. \[\therefore \]Gold number = miligram of starch \[=0.025\times {{10}^{3}}mg\] = 25


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