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NEET Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Self Evaluation Test - Surface Chemistry

  • 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

    A) 2.5                   

    B) 25    

    C) 0.25                 

    D) 0.025

    Correct Answer: B

    Solution :

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


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