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

Given below are two statements:
Statement I: Crystal Field Stabilization Energy (CFSE) of \([Cr(H_{2}O)_{6}]^{2+}\) is greater than that of \([Mn(H_{2}O)_{6}]^{2+}\).
Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium ferrocyanide.
In the light of the above statements, choose the correct answer from the options given below:

A Both Statement I and Statement II are true
B Both Statement I and Statement II are false
C Statement I is true but Statement II is false
D Statement I is false but Statement II is true

Verified Solution

Answer & Solution

Correct Answer

(A) Both Statement I and Statement II are true

Step-by-step Solution

Detailed explanation

\(\left[ Mn \left( H _2 O \right)_6\right]^{2+} \Rightarrow\) CFSE value is zero because of \(d ^5\) configuraiton with WFL in coordination number 6 \(\left[ Cr \left( H _2 O \right)_6\right]^{2+}\). \(\left[ Cr \left( H _2 O \right)_6\right]^{2+} \Rightarrow\) CFSE value is…

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\(-I\)	List\(-II\)
\(A\) \(16\,g \text { of } CH _{4( g )}\)	\(I\) Weighs \(28\,g\)
\(B\) \(1\,g \text { of } H _{2( g )}\)	\(II\) \(60.2 \times 10^{23}\) electrons
\(C\) \(1\,mole \text { of } N _{2( g )}\)	\(III\) Weighs \(32\,g\)
\(D\) \(0.5\,mol\) of \(SO _{2( g )}\)	\(IV\) Occupies \(11.4\,L\) volume at STP

Choose the correct answer from the options given below:

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Two small spherical balls of mass 10 g each with charges \(-2 \mu \mathrm{C}\) and \(2 \mu \mathrm{C}\), are attached to two ends of very light rigid rod of length 20 cm. The arrangement is now placed near an infinite nonconducting charge sheet with uniform charge density of \(100 \mu \mathrm{C} / \mathrm{m}^2\) such that length of rod makes an angle of \(30^{\circ}\) with electric field generated by charge sheet. Net torque acting on the rod is:
(Take \(\varepsilon_0: 8.85 \times 10^{-12} \mathrm{C}^2 / \mathrm{Nm}^2\))

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

List \(I\) (Mixture)	List \(II\) (Separation Technique)
\(A\) \(CHCl _3+ C _6 H _5 NH _2\)	\(I\) Steam distillation
\(B\) \(C _6 H _{14}+ C _5 H _{12}\)	\(II\) Differential extraction
\(C\) \(C _6 H _5 NH _2+ H _2 O\)	\(III\) Distillation
\(D\) Organic compound in \(H _2 O\)	\(IV\) Fractional distillation

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