A platinum compound of composition $PtCl X_{4} \cdot 2 NH X_{3}$ gives no precipitate with $AgNO X_{3}$ and has negligible conductivity in solution. Assuming an octahedral complex with monodentate ligands, the EAN of platinum ( $Z = 78$ ) in it, using EAN $= Z - oxidation state + 2 \times$ number of ligands, is

Answer: D

No ionisable chloride and no ions mean all four chlorides and both ammonia molecules are bound:

[Pt (NH X_{3}) X_{2} Cl X_{4}]

with coordination number 6. Pt is

+ 4

. EAN

= 78 - 4 + 2 \times 6 = 86