Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason .
Assertion A : ${[CoCl {({NH}_{3})}_{5}]}^{2 +}$ absorbs at lower wavelength of light with respect to ${[Co {({NH}_{3})}_{5} (H_{2} O)]}^{3 +}$
Reason : It is because the wavelength of the light absorbed depends on the oxidation state of the metal ion.
In the light of the above statements, choose the correct answer from the options given below:

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A is true but R is false

Both A and R are true but R is NOT the correct explanation of A

Both A and R are true and is the correct explanation of A

A is false but R is true

answer is D.

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Detailed Solution

${[COCl {({NH}_{3})}_{5}]}^{- 2}$ absorbs at higher wavelength light with respect to ${[CO {({NH}_{3})}_{5} (H_{2} O)]}^{- 3}$ is due to ligand strength {ligand strength order $Cl < H_{2} O$ }
(or) same metal and same oxidation state depends on ligand strength