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JEE Main & Advanced Chemistry Analytical Chemistry Question Bank Critical Thinking Analytical

  • question_answer
    Phosphoric acid \[\left( {{H}_{3}}P{{O}_{4}} \right)\] is tribasic acid and one of its salts is sodium dihydrogen phosphate \[\left( Na{{H}_{2}}P{{O}_{4}} \right)\]. What volume of 1 M \[NaOH\] solution should be added to 12 g of sodium dihydrogen phosphate (mol. wt. 120) to exactly convert it into trisodium phosphate \[N{{a}_{3}}P{{O}_{4}}\] [Kurukshetra CET 1998]

    A) 80 ml

    B) 100 ml

    C) 200 ml

    D) 300 ml

    Correct Answer: C

    Solution :

    \[1\times V=\frac{12}{120}\times 2=200ml\].


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