CFSE Comparison

Q.

Arrange the following complex ions in increasing order of crystal field splitting energy ${△}_0.$
$\left[Cr\right(Cl{)}_6{]}^{3-},\left[Cr\right(CN{)}_6{]}^{3-},\left[Cr\right(N{H}_3{)}_6{]}^{3+}$

Q.

The Crystal Field Stabilization Energy (CFSE) of $\left[{\mathrm{CoF}}_3{\left({\mathrm{H}}_2\mathrm{O}\right)}_3\right]({\mathrm{\Delta }}_0<\mathrm{P})$is:

1. $–0.8{∆}_0$

2. $–0.8{\mathrm{\Delta }}_0+2\mathrm{P}$

3. $–0.4{\mathrm{\Delta }}_0+\mathrm{P}$

4. $–0.4{∆}_0$

Q. Crystal field stabilization energy (CFSE) of $Mn\left[\right(H_{2}O{)}_6{]}^{+2}$ is:

1. $-0.6{\Delta }_o$
2. $-0.4{\Delta }_o$
3. $0$
4. $-0.8{\Delta }_o$

Q. Crystal field stabilization energy for $\left[Co\right(N{H}_3{)}_6{]}^{3+}$ octahedral complex excluding pairing energy is $x{\Delta }_o$. Then $\mid x\mid$ is:

Q. Reaction of $\left[Co\right(H_{2}O{)}_6{]}^{2+}$ with excess ammonia and in the presence of oxygen results into a diamagnetic product. Number of electrons present in $t_{2g}$-orbitals of the product is _______.

Q. Write short notes on the following:
Carbylamine reaction

Q. According to the band theory, increase in number of atoms participating in crystal formation leads to ________ in number of molecular orbitals containing electrons.

1. decrease
2. no change
3. increase
4. either increase or decrease, depending upon the size of the atoms

Q. Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).

1. 
2. 
3. 
4. 

Q.

What are the values of $\Delta U$ and $\Delta H$ when $10d{m}^3$ of Helium at NTP is heated in a cylinder to ${100}^{\circ }C$, assuming that the gas behaves ideally. ($C_V=\frac{3}{2}R$)

1. 

   

2. 

   

3. 

   

4. 

   

Q. The increasing order of acidities of the shown hydrogen atoms among the following is:

1. $III<II<I$
2. $II<I<III$
3. $I<II<III$
4. $II<III<I$

Q.

What will be the correct order for the wavelengths of absorption in the visible region for the following:
$\left[Ni\right(N{O}_2{)}_6{]}^{4-},\left[Ni\right(N{H}_3{)}_6{]}^{2+},\left[Ni\right(H_{2}O{)}_6{]}^{2+}?$

Q.

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $C{o}^{3+}$ is

1. $\left[Co\right(H_{2}O{)}_6{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+}$

2. $\left[Co\right(en{)}_3{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(H_{2}O{)}_6{]}^{3+}$

3. $\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+},\left[CO\right(H_{2}O{)}_6{]}^{3+}$

4. $\left[Co\right(H_{2}O{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+}$

Q. Which one of the following is the correct order of the wavelengths of absorption for complexes?
I: $\left[Ni\right(H_{2}O{)}_6{]}^{2+}$

1. I > II > III
2. III > I > II
3. II > I > III
4. III > II > I

Q. Assertion :After splitting of d-orbitals during complex formation, the orbitals form two sets of orbitals $t_{2g}$ and $e_g$ octahedral field. Reason: Splitting of d-orbitals occurs only in the case of strong field ligands Such as $C{N}^{-}$.

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. The Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Arrange the following
(i) In decreasing order of the $p{K}_b$ values: $C_2{H}_{5}N{H}_2,C_6{H}_{5}NHC{H}_3,(C_2{H}_5{)}_{2}NH$ and $C_6{H}_{5}N{H}_2$
(ii) In increasing order of basic strength: $C_6{H}_{5}N{H}_2,C_6{H}_{5}N(C{H}_3{)}_2,(C_2{H}_5{)}_{2}NH$ and $C{H}_{3}N{H}_2$
(iii) In increasing order of basic strength:
(a) Aniline, p-nitroaniline and p-toluidine

Q. $C{r}^{3+}$ form four complexes with four different ligands which are $\left[Cr\right(Cl{)}_6{]}^{3-},\left[Cr\right(H_{2}O{)}_6{]}^{3+},\left[Cr\right(N{H}_3{)}_6{]}^{3+}$ and $\left[Cr\right(CN{)}_6{]}^{3-}$. The order of CFSE $\left({\Delta }_o\right)$ in these complexes is in the order :

1. $[CrC{l}_6{]}^{3-}=[Cr(H_{2}O{)}_6{]}^{3+}=[Cr(N{H}_3{)}_6{]}^{3+}=[Cr(CN{)}_6{]}^{3-}$
2. $[CrC{l}_6{]}^{3-}>[Cr(H_{2}O{)}_6{]}^{3+}>[Cr(N{H}_3{)}_6{]}^{3+}>[Cr(CN{)}_6{]}^{3-}$
3. $[CrC{l}_6{]}^{3-}<[Cr(H_{2}O{)}_6{]}^{3+}<[Cr(N{H}_3{)}_6{]}^{3+}<[Cr(CN{)}_6{]}^{3-}$
4. $[CrC{l}_6{]}^{3-}<[Cr(H_{2}O{)}_6{]}^{3+}=[Cr(N{H}_3{)}_6{]}^{3+}<[Cr(CN{)}_6{]}^{3-}$

Q. In which of the following coordination entities, the magnitude of ${\Delta }_0[CFSE$ in octahedral field$]$ will be maximum ?

1. $\left[Co\right(CN{)}_6{]}^{3-}$
2. $\left[Co\right(N{O}_2{)}_6{]}^{3-}$
3. $[Co{F}_6{]}^{3-}$
4. $\left[Co\right(N{H}_3{)}_6{]}^{3+}$

Q. ${\left[\text{Ru}\right({\text{NH}}_3{)}_6]}^{3+}$ is an octahedral, ${\text{d}}^5$ low-spin complex, how many unpaired electrons does this complex have?

1. $3$
2. $1$
3. $4$
4. $5$

Q. Predict the order of ${\Delta }_o$ for the following compounds:-
(i) $\left[Cr\right(H_{2}O{)}_6{]}^{3+}$
(ii) $\left[Cr\right(CN{)}_2(H_{2}O{)}_4{]}^{-}$
(iii) $\left[Cr\right(CN{)}_4(H_{2}O{)}_2{]}^{-}$
(iv) $\left[Cr\right(CN{)}_6{]}^{3-}$

1. ${\Delta }_o\left(i\right)<{\Delta }_o\left(ii\right)<{\Delta }_o\left(iii\right)<{\Delta }_o\left(iv\right)$
2. ${\Delta }_o\left(ii\right)<{\Delta }_o\left(iii\right)<{\Delta }_o\left(iv\right)<{\Delta }_o\left(i\right)$
3. ${\Delta }_o\left(i\right)>{\Delta }_o\left(ii\right)>{\Delta }_o\left(iii\right)>{\Delta }_o\left(iv\right)$
4. ${\Delta }_o\left(ii\right)={\Delta }_o\left(iii\right)<{\Delta }_o\left(i\right)<{\Delta }_o\left(iv\right)$

Q. Predict the order of ${\Delta }_o$ for the following compounds:-
(i) $\left[Cr\right(H_{2}O{)}_6{]}^{3+}$
(ii) $\left[Cr\right(CN{)}_2(H_{2}O{)}_4{]}^{-}$
(iii) $\left[Cr\right(CN{)}_4(H_{2}O{)}_2{]}^{-}$
(iv) $\left[Cr\right(CN{)}_6{]}^{3-}$

1. ${\Delta }_o\left(i\right)<{\Delta }_o\left(ii\right)<{\Delta }_o\left(iii\right)<{\Delta }_o\left(iv\right)$
2. ${\Delta }_o\left(i\right)>{\Delta }_o\left(ii\right)>{\Delta }_o\left(iii\right)>{\Delta }_o\left(iv\right)$
3. ${\Delta }_o\left(ii\right)={\Delta }_o\left(iii\right)<{\Delta }_o\left(i\right)<{\Delta }_o\left(iv\right)$
4. ${\Delta }_o\left(ii\right)<{\Delta }_o\left(iii\right)<{\Delta }_o\left(iv\right)<{\Delta }_o\left(i\right)$

Q. (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCI ?

(ii) What type of stoichiometric defect is shown by NaCI ?

Q. Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $C{o}^{3+}$ is:

1. $\left[Co\right(H_{2}O{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+}$
2. $\left[Co\right(H_{2}O{)}_6{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+}$
3. $\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(en{)}_3{]}^{3+},\left[Co\right(H_{2}O{)}_6{]}^{3+}$
4. $\left[Co\right(en{)}_3{]}^{3+},\left[Co\right(N{H}_3{)}_6{]}^{3+},\left[Co\right(H_{2}O{)}_6{]}^{3+}$

Q. An organic compound (A) with molecular formula $C_7{H}_{8}O$ dissolves in NaOH and gives characteristic colour with $FeC{l}_3.$ On treatment with $B{r}_2,$ it gives a tribromo product $C_7{H}_{5}OB{r}_3.$ The compound is :

1. 2-Methoxy-2-phenyl propane
2. p-Hydroxybenzene
3. m-Cresol
4. p-Cresol

Q. (a) $\left[Ni\right(CN{)}_4{]}^{2-}$ , $\left[Pt\right(CN{)}_4{]}^{2-}$.

Q. If ${△}_0<P,$ where $P$ is pairing energy and ${△}_0$ is the crystal field spliting energy, the correct electronic configuration for $d^4$ system will be:

1. $t_{2g}^4{e}_g^0$
2. $t_{2g}^3{e}_g^1$
3. $t_{2g}^0{t}_g^4$
4. $t_{2g}^2{e}_g^2$

Q. Select the correct order of magnetic moment (in B.M.) from the following options :

1. $[MnC{l}_4{]}^{2-}>[CoC{l}_4{]}^{2-}>\left[Fe\right(CN{)}_6{]}^{4-}$
2. $\left[Fe\right(CN{)}_6{]}^{4-}>[MnC{l}_4{]}^{2-}>[CoC{l}_4{]}^{2-}$
3. $\left[Fe\right(CN{)}_6{]}^{4-}>[CoC{l}_4{]}^{2-}>[MnC{l}_4{]}^{2-}$
4. $[MnC{l}_4{]}^{2-}>[Fe(CN{)}_6{]}^{4-}>[CoC{l}_4{]}^{2-}$

Q.

Select the correct order of magnetic moment (in B.M.) from the following options:

1. $[MnC{l}_4{]}^{2-}>[CoC{l}_4{]}^{2-}>\left[Fe\right(CN{)}_6{]}^{4-}$

2. $\left[Fe\right(CN{)}_6{]}^{4-}>[MnC{l}_4{]}^{2-}>[CoC{l}_4{]}^{2-}$

3. $\left[Fe\right(CN{)}_6{]}^{2-}>[CoC{l}_4{]}^{2-}>[MnC{l}_4{]}^{2-}$

4. $[MnC{l}_4{]}^{2-}>[Fe(CN{)}_6{]}^{4-}>[CoC{l}_4{]}^{2-}$

Q. $H_{2}O$ is a weaker field ligand than $N{H}_3$ and ${\Delta }_{oct}$ $\left(\right[Cr\left(N{H}_3{)}_6{]}^{3+}\right)<{\Delta }_{oct}\left(\right[Cr\left(H_{2}O{)}_6{]}^{3+}\right)$
If true 1 else 0.

1. 0

Q. Among the following transitions in hydrogen and hydrogen like ion spectrum, which one emits light of longest wavelength?

1. n = 4 to n =3 for He${}^{+}$
2. n = 5 to n = 2 for H
3. n = 2 to n = 1 for H
4. n = 4 to n =3 fro Li${}^{2+}$

Q. Which of the following shows the correct order of decreasing basicity in aqueous medium?

1. $(C{H}_3{)}_{3}N>(C{H}_3{)}_{2}NH>C{H}_{3}N{H}_2>N{H}_3$
2. $(C{H}_3{)}_{2}NH>(C{H}_3{)}_{3}N>C{H}_{3}N{H}_2>N{H}_3$
3. $(C{H}_3{)}_{2}NH>C{H}_{3}N{H}_2>(C{H}_3{)}_{3}N>N{H}_3$
4. $(C{H}_3{)}_{2}NH>C{H}_{3}N{H}_2>N{H}_3>(C{H}_3{)}_{3}N$