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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc044

Three isomers of formula differ in how many chloride ions are free. In the isomer which on treatment of one mole with excess gives two moles of immediately, the number of water molecules directly coordinated to chromium (coordination number 6) is

  1. A6
  2. B3
  3. C5
  4. D4

Answer: C

Two free chlorides mean one chloride is bound. With coordination number 6 and one inside, five are coordinated. The formula is , whose sixth water is lattice water.
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