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JEE Main levelSingle correct optionDifficulty 2 of 3cc124

Assertion: gives no precipitate with and has negligible molar conductivity in solution. Reason: all three chloride ions are bonded to cobalt inside the coordination sphere.

  1. ABoth Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  2. BBoth Assertion and Reason are true but the Reason is not the correct explanation of the Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Answer: A

With Co(III), three and three give a neutral complex with no counter ions. All chlorides are coordinated, so none is free to precipitate with and there are no ions to conduct. The Reason therefore explains the Assertion.
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