JEE Main & Advanced Sample Paper JEE Main Sample Paper-38

  • question_answer 27) Amongst the following the compound that is both  paramagnetic and coloured is

    A)  \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]                

    B)  \[{{(N{{H}_{4}})}_{2}}[TiC{{l}_{6}}]\]        

    C)  \[CoS{{O}_{4}}\]                    

    D)  \[{{K}_{3}}[Cu{{(CN)}_{4}}]\]

    Correct Answer: C

    Solution :

     In \[{{(N{{H}_{4}})}_{2}}[(TiC{{l}_{6}})],\] \[T{{i}^{4+}}(3{{d}^{0}}\,\,4{{s}^{0}})\] has no unpaired electrons. In \[{{K}_{2}}C{{r}_{2}}{{O}_{7}},C{{r}^{6+}}\] \[(3{{p}^{6}}{{d}^{0}})\] has no unpaired electrons. In \[CoS{{O}_{4}},\,C{{o}^{2+}}({{d}^{7}})\] has unpaired electrons in d-orbitals, so it is both paramagnetic and coloured. In \[{{K}_{3}}[Cu{{(CN)}_{4}}],C{{u}^{+}}(3{{d}^{10}}),\] has no unpaired

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