The INCORRECT statement is :

  • Option 1)

    the gemstone,ruby,has Cr^{3+} ions occupying the octahedral sites of beryl.

  • Option 2)

    the spin-only magnetic moment of \left [ Ni\left ( NH_{3} \right ) _{4}\left ( H_{2}O \right )_{2}\right ]^{2+} is 2.83\; BM.

     

     

  • Option 3)

    the color of \left [ CoCl\left ( NH_{3} \right ) _{5}\right ]^{2+}is violet as it absorbs the yellow light.

  • Option 4)

    the spin-only magnetic moments of \left [ Fe\left ( H_{2}O \right ) _{6}\right ]^{2+} and \left [ C_{r}\left ( H_{2}O \right ) _{6}\right ]^{2+} are nearly similar.

Answers (1)
V Vakul

(1)  In ruby, the gemstone has Cr^{3+} ions occupying the octahedral sites of Aluminium oxide \left ( Al_{2}O_{3} \right ),Cr^{3+} ion normally occupied by Al^{3+} ion 

\left [ Ni\left ( NH_{3} \right ) _{4}\left ( H_{2}O \right )_{2}\right ]^{2+}\rightarrow N_{1}^{12+}\rightarrow 3d^{8}=2\; unpaired\; e^{s}\Rightarrow \mu _{m}=\sqrt{n\left ( n+2 \right )}=\; \; 2.83\; B.M

(3) The complementary colour of violet is yellow.

(4) Fe^{2+}\rightarrow 3d^{6}=4 \; unpaired \; e^{-}

      Cr^{2+}\rightarrow 3d^{4}=4 \; unpaired \; e^{-}


Option 1)

the gemstone,ruby,has Cr^{3+} ions occupying the octahedral sites of beryl.

Option 2)

the spin-only magnetic moment of \left [ Ni\left ( NH_{3} \right ) _{4}\left ( H_{2}O \right )_{2}\right ]^{2+} is 2.83\; BM.

 

 

Option 3)

the color of \left [ CoCl\left ( NH_{3} \right ) _{5}\right ]^{2+}is violet as it absorbs the yellow light.

Option 4)

the spin-only magnetic moments of \left [ Fe\left ( H_{2}O \right ) _{6}\right ]^{2+} and \left [ C_{r}\left ( H_{2}O \right ) _{6}\right ]^{2+} are nearly similar.

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