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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc080

Molar conductivity of $PtCl X_{4} \cdot 4 NH X_{3}$ (Pt coordination number 6) corresponds to three ions per formula unit. Its IUPAC name is

Atetraamminechloridoplatinum(IV) chloride
Btetraamminedichloridoplatinum(IV) chloride
Ctetraamminedichloridoplatinum(II) chloride
Ddiamminetetrachloridoplatinum(IV)

Answer: B

Three ions means one complex ion plus two free chloride ions, so two Cl are inside:

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

. The cation is

+ 2

, so

x - 2 = + 2

and Pt is +4. The name is tetraamminedichloridoplatinum(IV) chloride. The neutral

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

would be a non-electrolyte, and

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

would give four ions.

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