NEET · Chemistry · STD 12 - 5. Co-ordination chemistry

Which complex compound is most stable?

A \(\left[ Co \left( NH _3\right)_6\right]_2\left( SO _4\right)_3\)
B \(\left[ Co \left( NH _3\right)_4\left( H _2 O \right) Br \right]\left( NO _3\right)_2\)
C \(\left[ Co \left( NH _3\right)_3\left( NO _3\right)_3\right]\)
D \(\left[ CoCl _2(\text { en })_2\right] NO _3\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\left[ CoCl _2(\text { en })_2\right] NO _3\)

Step-by-step Solution

Detailed explanation

Chelating ligands in general form more stable complexes than their monodentate analogs \(\therefore\) The most stable complex is \(\left[ CoCl _2( en )_2\right] NO _3\)

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 the Xenon compounds in Column\(-I\) with its structure in Column\(-II\) and assign the correct code

Column\(-I\)	Column\(-II\)
\((a)\) \(\mathrm{XeF}_{4}\)	\((i)\) pyramidal
\((b)\) \(\mathrm{XeF}_{6} \)	\((ii)\) square planar
\((c)\) \(\mathrm{XeOF}_{4}\)	\((iii)\) distorted octahedral
\((d)\) \(\mathrm{XeO}_{3} \)	\((iv)\) square pyramidal

code : \((a) \quad (b)\quad (c) \quad (d)\)

NEET 2019 Hard

Energy and radius of first Bohr orbit of \(He ^{+}\)and \(Li ^{2+}\) are
\(\left[\text {Given } R_{H}=2.18 \times 10^{-18} J, a_0=52.9\text{pm}\right]\)

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