2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ

JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

  • question_answer
    When 2.5 g of a. sample of Mohr's salt reacts N completely with 50 mL of \[\frac{N}{10}KMn{{O}_{4}}\] solution. The % purity of the sample of Mohr's salt is:

    A) 78.4     

    B) 70   

    C) 37                                

    D) 40

    Correct Answer: A

    Solution :

    [a] m-eq.\[FeS{{O}_{4}}{{(N{{H}_{4}})}_{4}}S{{O}_{4}}.6{{H}_{2}}O\] \[=m-eq.\text{ }of\,KMn{{O}_{4}}\] (n=l) \[\frac{W}{392}\times 1\times 1000=0.1\times 50\]  Hence, % purity of Mohr's salt \[=\frac{1.96}{2.5}\times 100=78.4%\]                    \[W=1.96g\]      


You need to login to perform this action.
You will be redirected in 3 sec spinner