Hund's Rule

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

Q.

Elements in the same group have similar ____

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

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

Q. The orbital angular momentum for an $s$ electron will be given by:

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

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

1. 1
2. 2
3. \N
4. 3

Q. How many unpaired electron(s) are there in $N{i}^{2+}$ ion if the atomic number of Ni is 28

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

Q. If the electronic distribution of oxygen atom is given as
,
then it would violate:

1. Hund's rule
2. Pauli's exclusion principle
3. Both Hund's and pauli's principles
4. None of the above

Q. Which of the following represents the correct outer electronic configuration of silicon?

1. 
   
2. 
3. 
4. 

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

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

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

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

Q.

In the following questions two Statement - 1 (Assertion) and Statement - 2 (Reason) are provided. Each question has 4 choices (a), (b), (c) and (d) for its answer, out of which ONLY ONE is correct. Mark your responses from the following options:

Statement - 1 : The transition of electrons $n_3\to n_2$ in H - atom will emit radiation of higher frequency than $n_4\to n_3$.

Statement - 2 : Principal shells $n_2$ $n_3$ have lower energy than $n_4$.

1. Both Statement-1 and Statement - 2 are true and Statement - 2 is the correct explanation of Statement - 1

2. Both Statement - 1 and Statement - 2 are true and Statement - 2 is not the correct explanation of Statement - 1

3. Statement - 1 is true but Statement - 2 is false.

4. Statement - 1 is false but Statement - 2 is true.

Q. Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is:

1. 0 and diamagnetic
2. 1 and paramagnetic
3. 1 and diamagnetic
4. 0 and paramagnetic

Q. The absolute configuration at the two chiral centres in D- ribulose are

1. $3S,4R$
2. $3S,4S$
3. $3R,4R$
4. $3R,4S$

Q. A compound of vanadium has a magnetic moment μ of 1.73 BM. If the vanadium ion in the compound is present as $V^{x+}$, then the value of x is?

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

Q. Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is:

1. 1 and paramagnetic
2. 0 and paramagnetic
3. 1 and diamagnetic
4. 0 and diamagnetic