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

  • question_answer
    Under the influence of an electric field, heparticles in a sol migrate towards cathode. The coagulation of the same sol is studied using \[NaCl,N{{a}_{2}}S{{O}_{4}}\]and \[N{{a}_{3}}P{{O}_{4}}\] solutions. Their coagulating values will be in the order

    A) \[NaCl>N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}\]

    B) \[N{{a}_{2}}S{{O}_{4}}>N{{a}_{3}}P{{O}_{4}}>NaCl\]

    C) \[N{{a}_{3}}P{{O}_{4}}>N{{a}_{2}}S{{O}_{4}}>NaCl\]

    D) \[N{{a}_{2}}S{{O}_{4}}>NaCl>N{{a}_{3}}P{{O}_{4}}\]

    Correct Answer: A

    Solution :

    [a] Since the sol particles migrate towards cathode, they are positively charged. Hence, anions would be effective in coagulation. Greater is the valency of effective ion, smaller will be its coagulating value.


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