જ્યારે સાંદ્ર \(HCl\) ને \(CoCl_2\) ના જલીય દ્રાવણમાં ઉમેરવામાંઆવે ત્યારે તેનો રંગ લાલાશ પડતા ગુલાબી થી બદલાઇને ઘેરો ભૂરો થાય છે. આ પ્રક્રિયામાં ક્યો સંકીર્ણ આયન ભૂરો રંગ આપે છે ?

A \({\left[ {CoC{l_4}} \right]^{2 - }}\)
B \({\left[ {CoC{l_6}} \right]^{3 - }}\)
C \({\left[ {CoC{l_6}} \right]^{4 - }}\)
D \({\left[ {Co{{\left( {{H_2}O} \right)}_6}} \right]^{2 + }}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \({\left[ {CoC{l_4}} \right]^{2 - }}\)

Step-by-step Solution

Detailed explanation

Aqueous of solution of \(CoCl_2\) contains \([Co(H_2O)_6]^{2+}\) which is pinkish in colour so option \((d)\) is incorrect. Reduction potential of \(C{o^{3 \oplus }} \to C{o^{2 \oplus }}\) is high so option \((b)\) is incorrect. \(Co^{2+}\) does not oxidises easily to…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

સૂચિ \(- I\) સાથે \(- II\) ને જોડો.

સૂચિ -\(I\) (સ્પીસીઝો)	સૂચિ -\(I\) (ઈલેક્ટ્રોનિક વિતરણ)
\((A)\) \(\mathrm{Cr}^{+2}\)	\((I)\) \(3 \mathrm{~d}^8\)
\((B)\) \(\mathrm{Mn}^{+}\)	\((II)\) \(3 \mathrm{~d}^3 4 \mathrm{~s}^1\)
\((C)\) \(\mathrm{Ni}^{+2}\)	\((III)\) \(3\mathrm{~d}^4\)
\((D)\) \(\mathrm{V}^{+}\)	\((IV)\) \(3 \mathrm{~d}^5 4 \mathrm{~s}^1\)

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