Factors Affecting CFSE and Conclusions

Q. Amongst the following , the most stable complex is .

1. $Fe\left(C{O}_5\right)$
2. $\left[Fe\right(C{N}_6){]}^{3-}$
3. $\left[Fe\right(C_2{O}_4{)}_3{]}^{3-}$
4. $\left[Fe\right(H_{2}O{)}_6{]}^{3-}$

Q. $CuS{O}_4.5H_{2}O$ is blue is colour while anhydrous $CuS{O}_4$ is colourless due to:

1. Presence of strong field ligand in $CuS{O}_4.5H_{2}O$
2. Due to absence of water(ligand), d-d transitions is not possible in $CuS{O}_4$
3. anhydrous undergoes d-d transition due to crystal field splitting
4. colour is lost due to unpaired electrons

Q.

When excess ammonia is added to $CuS{O}_4$ solution, the deep blue coloured complex is formed. Complex is:

1. square planar, paramagnetic

2. tetrahedral, diamagnetic

3. tetrahedral, paramagnetic

4. square planar, diamagnetic

Q. The CFSE for octahedral $[CoC{l}_6{]}^{4-}$ is $18,000c{m}^{–1}$.
The CFSE for tetrahedral $[CoC{l}_4{]}^{2-}$ will be

1. $18,000c{m}^{–1}$
2. $16,000c{m}^{–1}$
3. $8,000c{m}^{–1}$
4. $20,000c{m}^{–1}$

Q. The factors that affect the crystal field splitting is

1. coordination number
2. oxidation state
3. ligand field strength
4. all of the above

Q. An aqueous pink solution of cobalt(II)chloride changes to deep blue on addition of excess of HCl. This is because

1. $\left[Co\right(H_{2}O{)}_6{]}^{2+}$ is transformed into $[CoC{l}_6{]}^{4–}$
2. $\left[Co\right(H_{2}O{)}_6{]}^{2+}$ is transformed into $[CoC{l}_4{]}^{2–}$
3. tetrahedral complexes have smaller crystal field splitting than octahedral complexes.
4. tetrahedral complexes have larger crystal field splitting than octahedral complex.

Q. The complex ion that has the minimum wavelength of absorption in the visible region is:

1. ${\left[Co\right(N{H}_3{)}_6]}^{3+}$
2. ${\left[CoCl\right(N{H}_3{)}_5]}^{2+}$
3. $\text{cis}-{\left[CoC{l}_2\right(N{H}_3{)}_4]}^{+}$
4. $\text{trans}-{\left[CoC{l}_2\right(N{H}_3{)}_4]}^{+}$

Q.

Give the electronic configuration of the following complexes on the basis of crystal field splitting theory. $[Co{F}_6{]}^{3-},[Fe(CN{)}_6{]}^{4-}$ and $\left[Cu\right(N{H}_3{)}_6{]}^{2+}.$

Q. most reactive halide towards sn1 reaction is tert-butyl chloride or allyl chloride?

Q. for oxaloto in coordination compound we have to use bis, tris or bi, tri?

Q.

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand.

Q. 16.EAN VALUE OF FERROCENE, WITH EXPLANATION?

Q.

Assertion

Lithium sulphate does not form alums.

Reason

$L{i}^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

1. Both the assertion and the reason are correct. The reason is the correct explanation for the assertion

2. Assertion is correct but the reason is incorrect

3. Both the assertion and the reason are correct. But the reason is not the correct explanation for the assertion

4. Both the reason and the assertion are incorrect

Q. For $M{n}^{3+}$, pairing energy is 28000 $c{m}^{-1}$. ${\Delta }_{o}for\left[Mn\right(CN{)}_6{]}^{3-}is38500c{m}^{-1}$. Which of the following is incorrect?

1. Complex will be coloured
2. Complex will be a low spin complex
3. Net CFSE = -33600 $c{m}^{-1}$
4. Complex will be colourless

Q. $\left[Pd\right(F\left)\right(Cl\left)\right(Br\left)\right(I){]}^{2-}$, has n number of geometrical Isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy $\left[CFSE\right]$ of $\left[Fe\right(C{N}_6{]}^{n-6}$, respectively, [Note: Ignore pairing energy].

1. 1.73 BM and $-2{△}_0$
2. 2.84 BM and $-1.6{△}_0$
   
3. 0 BM and $-2.4{△}_0$
4. 5.92 BM and 0

Q. Sort the following complexes according to their crystal field stabilization energy (CFSE)

1. $\left[Fe\right(CN{)}_6{]}^{3-}$
2. $[{\mathrm{CoCl}}_6{]}^{4-}$
3. $\left[\mathrm{Co}\right(\mathrm{CN}{)}_6{]}^{3-}$
4. ${\left[Fe\right(H_{2}O{)}_6]}^{3+}$

Q. Which one of the following complexes is violet in colour ?

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1. $F{e}_4\left[Fe\right(CN{)}_6{]}_3.H_{2}O$
2. $\left[Fe\right(SCN{)}_6{]}^{4-}$
3. $\left[Fe\right(CN{)}_6{]}^{4-}$
4. $\left[Fe\right(CN{)}_{5}NOS{]}^{4-}$

Q. The octahedral complex of a metal ion $M^{3+}$ with four monodentate ligands $L_1,L_2,L_3\text{and}{L}_4$ absorb wavelength in the region of red, green, yellow and blue, respectively. The increasing order of ligand strength of the four ligands is :

1. $L_3<L_2<L_4<L_1$
2. $L_1<L_2<L_4<L_3$
3. $L_4<L_3<L_2<L_1$
4. $L_1<L_3<L_2<L_4$

Q. The CFSE for octahedral $[CoC{l}_6{]}^{4-}$ is $18,000c{m}^{–1}$.
The CFSE for tetrahedral $[CoC{l}_4{]}^{2-}$ will be

1. $18,000c{m}^{–1}$
2. $16,000c{m}^{–1}$
3. $8,000c{m}^{–1}$
4. $20,000c{m}^{–1}$

Q. The $\left[Ti\right(NCS{)}_6{]}^{3-}$ ion exhibits a single absoption band at $544nm$. What will be the crystal field splitting energy of the complex? $(\text{Planck constant}=6.626\times {10}^{-34}Js)$

1. $12.5\times {10}^{-19}J$
2. $3.65\times {10}^{-19}J$
3. $2.65\times {10}^{18}J$
4. $2.65\times {10}^{-18}J$

Q. Describe Jahn Teller Effect.

Q. Assertion :Lithium does not form alums. Reason: Small $\left[Li\right(H_{2}O{)}_6{]}^{+}$ is too small to form a stable lattice required for alum formation.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Which of the following is/are true for crystal field theory?

1. Under the influence of an octahedral field, energy of $e_g$ orbitals is more than $t_{2g}$ orbitals.
2. Under the influence of tetrahedral field, energy of $e_g$ orbitals is more than $t_{2g}$ orbitals.
3. When ligands are weak $({\Delta }_0<P)$
   ${\Delta }_0$ = Crystal field splitting energy and
   P = pairing energy.
4. When ligands are strong $({\Delta }_0>P)$
   

Q. Give the electronic configuration of the following on the basis of crystal field splitting theory.
${\left[Co{F}_6\right]}^{3-}$ and ${\left[Cu{\left({NH}_3\right)}_6\right]}^{2+}$

Q. Among the ligands $N{H}_3,en,C{N}^{-}$ and $CO$ the correct order of their increasing field strength, is

1. $CO<N{H}_3<en<C{N}^{-}$
2. $N{H}_3<en<C{N}^{-}<CO$
3. $C{N}^{-}<N{H}_3<CO<en$
4. $en<C{N}^{-}<N{H}_3<CO$

Q. The band spectrum is caused by:

1. molecules
2. atoms
3. any substance in solid state
4. any substance in liquid state

Q. Assertion :It is not essential that all the lines available in the emission spectrum will also be available in the absorption spectrum. Reason: The spectrum of hydrogen atom has only absorption spectrum.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q.

The d - electron configurations of $M{n}^{2+},F{e}^{2+},C{o}^{3+},andN{i}^{2+}are3d^5,3d^6,3d^6,3d^8,$ respectively. Which of the following aqua complexes will exhibit the minimum paramagnetic behavior?

1. $\left[Fe\right(H_{2}O{)}_6{]}^{2+}$

2. $\left[Co\right(H_{2}O{)}_6{]}^{3+}$

3. $\left[Ni\right(H_{2}O{)}_6{]}^{2+}$

4. $\left[Mn\right(H_{2}O{)}_6{]}^{2+}$

Q.

1. True
2. False

Q. Which amongst the following metal carbonyls are inner orbital complexes with diamagnetic property?
(I) $Ni(CO{)}_4$; (II) $Fe(CO{)}_5$; (III) $V(CO{)}_6$; (IV) $Cr(CO{)}_6$
Select the correct answer from the codes gives below:

1. I and II only
2. II, III and IV only
3. II and IV only
4. I, II and only