JEE Main & Advanced Chemistry Chemical Bonding and Molecular Structure / रासायनिक आबंधन एवं आणविक संरचना Question Bank Self Evaluation Test - Chemical Bonding and Molecular Structure

  • question_answer
    In\[PO{{_{4}^{3}}^{-}}\], the formal charge on each oxygen atom and the \[P-O\]bond order respectively are

    A) \[-0.75,0.6\]                  

    B) \[-0.75,\text{ }1.0\]

    C) \[-0.75,\text{ }1.25.\]    

    D) \[-3,\text{ }1.25\]

    Correct Answer: C

    Solution :

     
    [c] \[{{\left[ O-\overset{O}{\mathop{\overset{||}{\mathop{\overset{|}{\mathop{\underset{O}{\mathop{\underset{|}{\mathop{P}}\,}}\,}}\,}}\,}}\,-O \right]}^{3-}}\leftrightarrow {{\left[ O=\overset{O}{\mathop{\overset{|}{\mathop{\underset{O}{\mathop{\underset{|}{\mathop{P}}\,}}\,}}\,}}\,-O \right]}^{3-}}\]
    Bond order
    \[=\frac{Number\text{ }of\text{ }bonds}{Number\text{ }of\text{ }Resonating\text{ }structures}\]
    \[=\frac{5}{4}=1.25\]
    Three unit negative charge is being shared by four 0 atoms. Formal charge \[=-3/4\]
    \[=-0.75\]         


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