Which one of the following complexes is paramagnetic?

The total number of isomers for square planar complex $[Pd(H_2O)(Br)(NH_3)(CN)]$ is/are

Which isomer of $CrCl_3 \cdot 6H_2O$ is green in color and reacts with $AgNO_3$ to form one mole of $AgCl$?

On treatment of $[Ni(NH_3)_4]^{2+}$ with concentrated $HCl,$ two compounds $I$ and $II$ having the same formula,$Ni(NH_3)_2Cl_2$ are obtained. $I$ can be converted into $II$ by boiling with dilute $HCl.$ $A$ solution of $I$ reacts with oxalic acid to form $[Ni(NH_3)_2(C_2O_4)]$ whereas $II$ does not react. Point out the correct statement of the following:

The magnetic moment of $K_3[FeF_6]$ is ..... $B.M.$

The unmatched characteristic of the complex $[PdCl_2(H_2O)_2(NH_3)_2]^{2+}$ is: