Assertion :The electronic absorption spectrum of the tetrahedral complex, $[C o C l_{4}]^{2 -}$ shows bands which are more intense compared to the absorption bands for the octahedral complex $[C o (H_{2} O)_{6}]^{2 +}$ . Reason: The octahedral complexes possess a centre of symmetry.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
The electronic absorption spectrum of the tetrahedral complex, $[C o C l_{4}]^{2 -}$ shows bands which are more intense compared to the absorption bands for the octahedral complex $[C o (H_{2} O)_{6}]^{2 +}$ because $H_{2} O$ is moderately strong ligand and it will pair up the electrons.
The octahedral complexes possess a centre of symmetry.

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Assertion :The electronic absorption spectrum of the tetrahedral complex, [CoCl4]2− shows bands which are more intense compared to the absorption bands for the octahedral complex [Co(H2O)6]2+. Reason: The octahedral complexes possess a centre of symmetry.

Assertion :The electronic absorption spectrum of the tetrahedral complex, $[C o C l_{4}]^{2 -}$ shows bands which are more intense compared to the absorption bands for the octahedral complex $[C o (H_{2} O)_{6}]^{2 +}$ . Reason: The octahedral complexes possess a centre of symmetry.