Chemistry - Complete d-block Question with Solution | TestHub

$\text{X=}$black,${\text{MnO}}_2,$$\text{Y=}$Blue,${\text{K}}_{\text{2}}{\text{CrO}}_{\text{4}}\text{,}{\text{Z=KMnO}}_4$

$\text{X=}$green,${\text{Cr}}_{\text{2}}{\text{O}}_{\text{3}}\text{,}\text{Y=}$Yellow,${\text{K}}_{\text{2}}{\text{CrO}}_{\text{4}}\text{,}{\text{Z=K}}_{\text{2}}{\text{Cr}}_{\text{2}}{\text{O}}_{\text{7}}$

$\text{X=}$black,${\text{MnO}}_2,$$\text{Y=}$green,${\text{K}}_{\text{2}}{\text{MnO}}_{\text{4}}\text{,}$${\text{Z=KMnO}}_4$

$\text{X=}$black;${\text{Bi}}_{\text{2}}{\text{O}}_{\text{3}}\text{,}\text{Y=}$colourless${\text{KBiO}}_{\text{2}}\text{,}\text{Z=}{\text{KBiO}}_{\text{3}}$