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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3cc090

For the hydrate isomers , and , select the correct statements.

  1. AIn all three isomers the coordination number of Cr is 6 and Cr is +3
  2. BOne mole of precipitates 3 mol of AgCl with excess
  3. C is named pentaaquachloridochromium(III) chloride monohydrate
  4. DOne mole of precipitates 2 mol of AgCl with excess

Answer: A, B, C

Only ionisable chloride outside the coordination sphere precipitates: 3, 2 and 1 mol respectively, so the last statement (2 mol) is false. All three have six donor atoms, and the charge balance gives Cr(III) in each. The second isomer has five aqua ligands, one chlorido, two ionic chloride and one water of crystallisation, so the name ends in monohydrate.
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