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

  • question_answer
    About \[6\times {{10}^{-3}}\] mol \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] reacts completely with \[9\times {{10}^{-3}}\] mol \[{{X}^{n+}}\] to give \[X{{O}^{-}}_{3}\] and \[C{{r}^{3+}}\]. The value of \[n\] is:

    A) 1

    B) 2           

    C) 3

    D) none of these

    Correct Answer: A

    Solution :

    [a]\[{{K}_{2}}C{{r}_{2}}{{O}_{7}}+{{X}^{n+}}\to {{X}^{5+}}O_{3}^{-}+C{{r}^{3+}}\] \[6\times {{10}^{-3}}\times 6=(5-n)\times 9\times {{10}^{-3}}\Rightarrow \,n=1\]


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