Crystal Field Split in Octahedral Complexes

Q.

Explain the significance of quantum number.

Q.

What happens to the ionization enthalpy among the $3\mathrm{d}$ transition series?

Q.

Draw figure to show the splitting of d-orbitals in an octahedral crystal field.

Q.

Give in brief ${\mathrm{O}}_2$is paramagnetic and N₂ is diamagnetic.

Q.

What is the approximate ratio of the mass of proton and electron?

Q.

Two radial and two angular nodes are present in the orbital.

1. $5\mathrm{d}$

2. $4\mathrm{f}$

3. $3\mathrm{p}$

4. $4\mathrm{d}$

Q.

Accordung to crystal Field theory ,

If splitting energy is higher than the pairing energy (∆s >∆p) in an octahedral complex

Then will the electrons pair up or will they not?

I am confused because

In the video, it was said that they'll pair up if ∆p>∆s

And in my book, it's written that they'll pair up if ∆s>∆p

Q. Number of $s{p}^3$ hybridised atom in borax $N{a}_2{B}_4{O}_7,10H_{2}O$ is $x$. Find the value of $\frac{x}{19}$

Q.

Using crystal field theory, draw energy level diagram, write electronic configuration of the central metal atom/ion and determine the magnetic moment value in the following
(a) $[Co{F}_6{]}^{3-},[Co(H_{2}O{)}_6{]}^{2+},[Co(CN{)}_6{]}^{3-}$
(b) $Fe{F}_6^{3-},\left[Fe\right(H_{2}O{)}_6{]}^{2+},\left[Fe\right(CN{)}_6{]}^{4-}$

Q.

Three complexes ${\left[\mathrm{CoCl}{\left({\mathrm{NH}}_3\right)}_5\right]}^{2+}$(I), ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5{\mathrm{H}}_2\mathrm{O}\right]}^{3+}$(II), and ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_6\right]}^{3+}$(III) absorb light in the visible region. The correct order of the wavelength of light absorbed by them is:

1. $\left(\mathrm{III}\right)>\left(\mathrm{I}\right)>\left(\mathrm{II}\right)$

2. $\left(\mathrm{I}\right)>\left(\mathrm{II}\right)>\left(\mathrm{III}\right)$

3. $\left(\mathrm{II}\right)>\left(\mathrm{I}\right)>\left(\mathrm{III}\right)$

4. $\left(\mathrm{III}\right)>\left(\mathrm{II}\right)>\left(\mathrm{I}\right)$

Q.

In which of the following coordination entities, the magnitude of ${\Delta }_{\circ }$ [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.

What is the difference between ${\mathrm{Fe}}^{2+}$and ${\mathrm{Fe}}^{3+}$?

Q.

Please explain shielding effect .

Q.

On the basis of crystal field theory explain why Co(III) forms paramagnetic octahedral complex with weak field ligands whereas it forms diamagnetic octahedral complex with strong field ligands.

Q.

Atomic number of Mn, Fe, Co and Ni are 25, 26, 27 and 28 respectively. Which of the following outer orbital octahedral complexes have same number of unpaired electrons?
(a) $[MnC{l}_6{]}^{3-}$
(b) $[Fe{F}_6{]}^{3-}$
(c) $[Co{F}_6{]}^{-3-}$
(d) $\left[Ni\right(N{H}_3{)}_6{]}^{2+}$

Q. What will be the value of the equivalent weight of $KBr{O}_3$ in the following ionic equation?
$2Br{O}_3^{-}+12H^{+}+10e^{-}\to B{r}_2+6H_{2}O$
(Given: The molecular weight of $KBr{O}_3$ is $M$.)

1. $\frac{M}{4}$
2. $\frac{M}{6}$
3. $\frac{M}{10}$
4. $\frac{M}{5}$

Q. In the crystal field of the complex ${\left[Fe\right(Cl\left)\right(CN{)}_4\left(O_2\right)]}^{4-}$, the electronic configuration of the metal is found to be $t_{2g}^6{e}_g^0$. Which of the following is true about this complex ion?

1. It is a paramagnetic complex
2. $O-O$ bond length will be less than what is found in the $O_2$ molecule
3. Its IUPAC name will be chlorotetracyanosuperoxidoferrate(II) ion
4. It is a diamagnetic complex

Q.

What are the primary and secondary valencies of copper in Tetraammine copper ll sulphate?

Q. Ni(CO)4 is high spin complex or low spin complex ? It is tetrahedral molecule so it should be high spin complex ( as tetrahedral complex are always high spin )

Q. What is the shape of Fe(CO)5 and which d orbital involved in hybridization?

Q. Select the correct statement(s):-
i)Schottky defect is shown by CsCl
ii)Frenkel defect is shown by Zns
iii)Hexagonal close packing (hcp) & Cubic close packing (ccp) structure has same co-ordination no.12

iv) At high pressure, the co-ordination number increases.

1. i, ii, iii & iv

2. i, ii, & iv

3. ii, iii & iv

4. i, iii& iv

Q. Match the properties given in Column $I$ with the metals given in Column $II$.

	Column I (Property)		Column II (Metal)
(A)	Element with highest second ionisation enthalpy	(i)	$Co$
(B)	Element with highest third ionisation enthalpy	(ii)	$Cr$
(C)	$M$ in $M(CO{)}_6$ is	(iii)	$Cu$
(D)	Element with highest heat of atomisation	(iv)	$Zn$
		(v)	$Ni$

Q. The effective atomic number (EAN) for $\left[Fe\right(CN{)}_6{]}^{3-}$?

1. $36$
2. $35$
3. $34$
4. $37$

Q.

Which of the following contain maximum number of molecules at STP 100g of $CaC{O}_3$ 44.8 L of $O_3$, 2g of $H_2$ and 16g of $O_2$.

Q. The crystal field splitting energy CFSE $\left(In{\Delta }_{0}units\right)$ for $[Co{F}_6{]}^{3-}$ will be:

1. $-1.6{\Delta }_0$
2. $-2.4{\Delta }_0$
3. $-0.4{\Delta }_0$
4. $+0.6{\Delta }_0$

Q. A d-block element forms an octahedral complex but its spin magnetic moment remains the same in the presence of both strong field and weak field ligands. Which of the following is/are correct?

1. It always forms colourless compounds
2. The number of electrons in $t_{2g}$ orbitals is more than those in $e_g$ orbitals
3. It can have either $d^3$ or $d^8$ configuration
4. It can have either $d^7$ or $d^8$configuration

Q.

Draw figure to show the splitting of d orbitals in an octahedral crystal field.

Q. The tetrachloro complexes of $Ni\left(II\right)$ and $Pd\left(II\right)$ are respectively:

(atomic number of $Ni$ and $Pd$ are $28$ and $46$ respectively)

1. Diamagnetic and Diamagnetic
2. Paramagnetic and Paramagnetic
3. Diamagnetic and Paramagnetic
4. Paramagnetic and Diamagnetic

Q. how to find the trend of thermal stability for carbonates and hydride of p block elements

Q. In hexacyanomanganate (II) ion, the $Mn$ atom assumes a $d^{2}s{p}^3-$ hybrid state. The number of unpaired electrons in the complex is:

1. 2
2. 3
3. 0
4. 1