Tag: magnetic nature of transition metals

$\,{\text{AgN}}{{\text{O}} _3}$

$\,{\text{CuS}}{{\text{O}} _4}$

${\text{CuCl}}$

${\text{ZnC}}{{\text{l}} _{\text{2}}}$

pink

yellow

violet

blue

$d-d$ transition

$L\rightarrow M$ charge transfer transition

$\sigma-\sigma^{*}$ transition

$M\rightarrow L$ charge transfer transition

$V^{+4}, Cu^{+2}$

$Co^{+2}, Ni^{+2}$

$Fe^{+3}, Ti^{+3}$

$Co^{+2}, Fe^{+3}$

${K} _{2}{Cr} _{2}{O} _{7}$

$KMn{O} _{4}$

$Cu{SO} _{4}.5{H} _{2}O$

Both (1) and (2)

${\text{TiC}}{{\text{l}} _{\text{4}}}$ is a colourless compound.

$\left[ {{\text{Cr}}{{\left( {{\text{N}}{{\text{H}} _{\text{3}}}} \right)} _{\text{6}}}} \right]{\text{C}}{{\text{L}} _{\text{3}}}$ is a coloured compound

${{\text{K}} _{\text{3}}}\left[ {{\text{V}}{{\text{F}} _{\text{6}}}} \right]$ is a colourless compound

$\;\left[ {{\text{Cu}}{{\left( {{\text{NCC}}{{\text{H}} _{\text{3}}}} \right)} _{\text{4}}}} \right]\left[ {{\text{B}}{{\text{F}} _{\text{4}}}} \right]$ is a colourless compound

green

deep blue

yellow

red

${Ni}^{2+}$

${Fe}^{2+}$

${Cu}^{2+}$

${Cu}^{+}$

$d-d$ transition

charge transfer

change in the geometry

none

${Fe}^{3+}$ gives brown color with potassium ferricyanide

${Fe}^{2+}$ gives blue precipitate with potassium ferricyanide

${Fe}^{3+}$ gives red color with potassium thiocyanate

${Fe}^{2+}$ gives brown color with ammonium thiocyanate