Which from the following ligands is able to form linkage isomers?

Which of the following is paramagnetic?

Which compound has a magnetic moment equal to $4.90 \ B.M.$?

The correct order of intensity of colors of the compounds is:

$26.7 \ g$ of a compound with the formula $PtCl_2Br_2 \cdot 6H_2O$ is taken for analysis. This compound exhibits stereoisomerism,and a total of $3$ stereoisomers exist. Find the loss in mass (in $g$) when the given amount of the compound is treated with concentrated $H_2SO_4$. (Molar mass: $PtCl_2Br_2 \cdot 6H_2O = 534 \ g \ mol^{-1}$)

Which of the following pairs of transition metal ions have the same calculated values of magnetic moment?