Among [Ni(CO)₄], [NiCl₄]^2$$-$$, [Co(NH₃)₄)Cl₂]Cl, Na₃[CoF₆], Na₂O₂ and CsO₂, the total number of paramagnetic compound is

Match each coordination compound in List I with an appropriate pair of characteristics from List II and select the correct answer using the code given below the lists.

{en = H₂NCH₂CH₂NH₂; atomic numbers : Ti = 22, Cr = 24; Co = 27; Pt = 78}

Consider the following complex ions : P, Q and R.

$$P = {[Fe{F_6}]^{3 - }}$$, $$Q = {[V{({H_2}O)_6}]^{2 + }}$$ and $$R = {[Fe{({H_2}O)_6}]^{2 + }}$$

The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is

The pair(s) of coordination complexes/ions exhibiting the same kind of isomerism is(are)