JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry

The complex that has highest crystal field splitting energy \((\Delta )\) is

A \([Co(NH_3)_5(H_2O)]Cl_3\)
B \(K_2[CoCl_4]\)
C \([Co(NH_3)_5Cl]Cl_2\)
D \(K_3[Co(CN)_6]\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(K_3[Co(CN)_6]\)

Step-by-step Solution

Detailed explanation

As \(CN^-\) is a strong field ligand. \(K_3[Co(CN)_6]\) will have maximum \(‘\Delta ’.\)

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

Match List \(I\) with List \(II\).

List \(-I\)(Element)	List \(-II\) (Electronic Configuration)
\(A.\) \(N\)	\(I.\) \([\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 4 \mathrm{p}^5\)
\(B.\) \(S\)	\(II.\) \([\mathrm{Ne}] 3 \mathrm{~s}^2 3 \mathrm{p}^4\)
\(C.\) \(Br\)	\(III.\) \([\mathrm{He}] 2 \mathrm{~s}^2 2 \mathrm{p}^3\)
\(D.\) \(Kr\)	\(IV.\) \([\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^2 4 \mathrm{p}^6\)

Choose the correct answer from the options given below:

JEE Mains 2024 Medium

Given below are two statements :
Statement (I) : Potassium hydrogen phthalate is a primary standard for standardisation of sodium hydroxide solution.
Statement (II) : In this titration phenolphthalein can be used as indicator.
In the light of the above statements, choose the most appropriate answer from the options given below:

JEE Mains 2024 Medium

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