Hund's Rule

Q.

What is the electron configuration of sodium ion?

Q.

The bond order and magnetic characteristics of CN^- are :-

1. 3, Paramagnetic

2. 2.5, Diamagnetic

3. 3, Diamagnetic

4. 2.5, Paramagnetic

Q. Which of the following ions has the highest magnetic moment?

1. $F{e}^{2+}$
2. $M{n}^{2+}$
3. $C{r}^{3+}$
4. $V^{3+}$

Q. The orbital angular momentum of a 4d electron will be:

1. $4\frac{h}{2\pi }$
2. $\sqrt{6}\frac{h}{2\pi }$
3. $\sqrt{6}\frac{h}{4\pi }$
4. $\sqrt{2}\frac{h}{4\pi }$

Q. Which one is a wrong statement?

1. The electronic configuration of N atom is:
   
2. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers
3. Total orbital angular momentum of electron in 's' orbital is equal to zero
4. The value of m for $d_z^2$ is zero

Q. The number of unpaired electrons in $M{n}^{4+}$(Z=25) is

1. Four
2. Two
3. Five
4. Three

Q. If only 2 hexagonal layers are kept completely each one over other (AA type stacking). Find the coordination number of any atom present in a layer.

1. $12$
2. $8$
3. $7$
4. $4$

Q. Orbital angular momentum of an electron in a particular subshell is $\sqrt{5}\frac{h}{\pi }$ . Then find the maximum number of electrons which may be present in this subshell.

1. 18
2. 24
3. 16
4. 8

Q. The number of unpaired electrons in the ground state of $Cl$ atom $(atomicnumber=17)$ is:

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

Q. Which of the following is the correct electronic configuration for oxygen according to Hund's rule?

1. $1s^{2}2s^{2}2p_x^{2}2p_y^{2}2p_z^0$
2. $1s^{2}2s^{1}2p_x^{2}2p_y^{1}2p_z^2$
3. $1s^{1}2s^{2}2p_x^{2}2p_y^{2}2p_z^1$
4. $1s^{2}2s^{2}2p_x^{2}2p_y^{1}2p_z^1$

Q. The ratio of orbital angular momentum and spin angular momentum of an electron in $p$ orbital is:

1. $\frac{3}{2}$
2. $\sqrt{\frac{3}{2}}$
3. $\frac{2\sqrt{2}}{\sqrt{3}}$
4. $\sqrt{\frac{2}{3}}$

Q. Cyanide ion acts as an ambident nucleophile. From which end it acts as a stronger nucleophile in aqueous medium?

1. It acts as a stronger nucleophile from carbon end
2. It acts as a stronger nucleophile from nitrogen end
3. It depends on the nature of the alkyl halide.
4. It has same strength from both the ends

Q. Match column I with column II (showing electron spins in a magnetic domain in absence of magnetic field) and make the appropriate choice.

Column I	Column II
(A)	Ferromagnetic	(i)
(B)	Ferrimagnetic	(ii)
(C)	Antiferromagnetic	(iii)
(D)	Diamagnetic	(iv)
(E)	Paramagnetic	(v)

1. (A)$\to$(iii), (B)$\to$(i), (C)$\to$(ii), (D)$\to$(iv), (E)$\to$(v)
2. (A)$\to$(i), (B)$\to$(ii), (C)$\to$(iii), (D)$\to$(iv), (E)$\to$(v)
3. (A)$\to$(iv), (B)$\to$(i), (C)$\to$(iii), (D)$\to$(ii), (E)$\to$(v)
4. (A)$\to$(v), (B)$\to$(iv), (C)$\to$(iii), (D)$\to$(ii), (E)$\to$(i)

Q. Can d8( high spin) complex form an octahedral complex.if not, why?give full explaination in detail.

Q.

In the sixth period, the orbitals that are filled are:

1. $6\mathrm{s},5\mathrm{d},5\mathrm{f},6\mathrm{p}$

2. $6\mathrm{s},4\mathrm{f},5\mathrm{d},6\mathrm{p}$

3. $6\mathrm{s},6\mathrm{p},6\mathrm{d},6\mathrm{f}$

4. $6\mathrm{s},5\mathrm{f},6\mathrm{d},6\mathrm{p}$

Q. According to molecular orbital theory, the number of unpair electrons(s) in$O_2^{2-}$ is

Q. The principles that gives the correct explanation why ground state electronic configuration of $Si$ is
and not
is:

1. Heisenberg's uncertainty principle
2. Hund's rule
3. Pauli's exclusion principle
4. Aufbau Principle

Q. Three moles of \(Ag Cl\) get precipitated when one mole of an octahedral co-ordination compound with empirical formula \(CrCl_3.3NH_3. 3H_2O\) reacts with excess of silver nitrate. The number of chloride ions satisfying the secondary valency of the metal ion is________.

Q. The ratio of magnetic moments of $Fe\left(III\right)$ and $Co\left(II\right)$ is:

1. $\sqrt{5}:\sqrt{7}$
2. $\sqrt{24}:\sqrt{15}$
3. $\sqrt{35}:\sqrt{15}$
4. $7:3$

Q. The absolute configurations of the two centers in the following molecule are :

1. $2\left(R\right),3\left(S\right)$
2. $2\left(R\right),3\left(R\right)$
3. $2\left(S\right),3\left(S\right)$
4. $2\left(S\right),3\left(R\right)$

Q. Number of unpaired electrons in $M{n}^{3+}$ is

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

Q. Cyanide anion has two atoms that have lone pair of electrons. Either could act as nucleophile in the reaction. Yet in the vast majority of the cases, carbon acts as nucleophile and forms a bond to the substrate why?

1. Nitrogen is strongly solvated in hydroxylic sovents. It will be less reactive
2. Carbon is more reactive in polar aprotic solvents, normally used for these $S_{N}2$ reaction
3. Carbon site is more nucleophilic than Nitrogen site
4. The lone pair of electrons on C is in sp hybrid orbital

Q. Which of the following represents the correct outer configuration of Nitrogen?

1. 
2. 
3. 
4. All of the above

Q. In the following electronic arrangement, which of the following is violated?


I: Hund's rule
II: Pauli's exclusion principle
III: Aufbau principle

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

Q.

State the electronic configuration for neon (p = 10, n = 10).

Q. The preference of three unpaired electrons in the ground state of phosphorous can be explained by:

1. Pauli's exclusion principle
2. Aufbau principle
3. Heisenberg's uncertainty principle
4. Hund's rule

Q.
Which of the Fischer projection is different from the other three?

1. (1)
2. (2)
3. (3)
4. (4)

Q.

Can Hund's rule of maximum multiplicity be also called Hund's rule of maximum spin multiplicity ?

Q. Explain Hund's rule with an example.

Q.

According to Paulis Exclusion Principle, what is the maximum number of electrons that can be present in d-obitals and f-orbitals? Explain.