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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc058

0.010 mol of a cobalt(III) salt of empirical formula (coordination number 6) gives 1.435 g of AgCl with excess (Ag = 108, Cl = 35.5). Its IUPAC name is

  1. Adichloridotetraamminecobalt(III) chloride
  2. Btetraamminechloridocobalt(III) dichloride
  3. Ctetraamminedichloridocobalt(III) chloride
  4. Dtetraamminedichloridocobalt(II) chloride

Answer: C

Molar mass of AgCl is 143.5, so 1.435 g is 0.010 mol: only one of three Cl is ionic. The other two Cl and four NH3 fill six sites, so the cation is . Alphabetical order puts ammine before chlorido, and Co is +3 ().
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