Lanthanides Electronic Configuration

Q. Energy needed to excite electron from ground state to 3^rd excited state is x times the energy needed to excite from n = 2 state to 4^th excited state in H-like species. What is the value of x?

H के समान स्पीशीज में आद्यावस्था से 3^rd उत्तेजित अवस्था में इलेक्ट्रॉन को उत्तेजित करने के लिए आवश्यक ऊर्जा n = 2 अवस्था से 4^th उत्तेजित अवस्था में इलेक्ट्रॉन को उत्तेजित करने के लिए आवश्यक ऊर्जा का x गुना है। x का मान क्या है?

1. $\frac{128}{27}$
   
2. $\frac{32}{27}$
   
3. $\frac{27}{32}$
   
4. $\frac{125}{28}$
   

Q. The general electronic configuration of lanthanides is

1. $5f^{1-14}6d^{0-1}5s^2$
2. $4f^{1-14}5d^{0-1}6s^2$
3. $6f^{1-14}7d^{0-1}6s^2$
4. $7f^{1-14}8d^{0-1}7s^2$

Q. The outer electronic configuration of Gd (Atomic No: 64) is:

1. 4f⁸ 5d⁰ 6s²
2. 4f⁴ 5d⁴ 6s²
3. 4f⁷ 5d¹ 6s²
4. 4f³ 4d⁵ 6s²

Q. The general electronic configuration of lanthanides is

1. $4f^{1-14}5d^{0-1}6s^2$
2. $6f^{1-14}7d^{0-1}6s^2$
3. $7f^{1-14}8d^{0-1}7s^2$
4. $5f^{1-14}6d^{0-1}5s^2$

Q. The electronic configuration of Ag atom is

1. $\left[Kr\right]4d^{10}4s^1$
2. $\left[Xe\right]4f^{14}{d}^{10}6s^1$
3. $\left[Kr\right]4d^{10}5s^1$
4. $\left[Kr\right]4d^{9}5s^2$

Q. The valence shell electronic configuration of $C{r}^{2+}$ ion is :

1. $4s^{0}3d^4$
2. $4s^{2}3d^2$
3. $4s^{2}3d^0$
4. $3p^{6}4s^2$

Q. Argon which is the noble gas is an active element.

1. True
2. False

Q. Assertion: Separation of Zr and Hf is difficult.
Reason: Because Zr and Hf lie in the same group of the periodic table.

1. Both assertion and reason are false.
2. Both assertion and reason are true, and reason is the correct explanation of the assertion.
3. Both assertion and reason are true but reason is not the correct explanation of assertion.
4. Assertion is not true but reason is true.

Q. Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

1. $\left[Xe\right]4f^{9}5s^1$
2. $\left[Xe\right]4f^{7}5d^{1}6s^2$
3. $\left[Xe\right]4f^{6}5d^{2}6s^2$
4. $\left[Xe\right]4f^{8}6d^2$

Q. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

1. $\left[Xe\right]4f^{7}6s^2,\left[Xe\right]4f^{8}6s^{2}and\left[Xe\right]4f^{8}5d^{1}6s^2$
2. $\left[Xe\right]4f^{6}5d^{1}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{9}6s^2$
3. $\left[Xe\right]4f^{6}5d^{1}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{8}5d^{1}6s^2$
4. $\left[Xe\right]4f^{7}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{9}6s^2$

Q. The electronic configurations of Eu (Atomic No. 63), Gd (Atomic No. 64) and Tb (Atomic No. 65) are

1. $\left[Xe\right]4f^{7}6s^2,\left[Xe\right]4f^{8}6s^{2}and\left[Xe\right]4f^{8}5d^{1}6s^2$
2. $\left[Xe\right]4f^{6}5d^{1}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{8}5d^{1}6s^2$
3. $\left[Xe\right]4f^{6}5d^{1}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{9}6s^2$
4. $\left[Xe\right]4f^{7}6s^2,\left[Xe\right]4f^{7}5d^{1}6s^{2}and\left[Xe\right]4f^{9}6s^2$

Q. Which of the following represents the electronic configuration of a transition element

1. $1s^2,2s^2{p}^6......n{s}^2{p}^3$
2. $1s^2,2s^2{p}^6......n{s}^2{p}^3,(n+1)s^2$
3. $1s^2,2s^2{p}^6......n{s}^2{p}^6{d}^{10},(n+1)s^2{p}^1$
4. $1s^2,2s^2{p}^6......n{s}^2{p}^6$

Q. Statement - 1: 'La' should be the f - block element according to Aufbau principle.
Statement - 2: 57th electron exceptionally enters into the 5d - orbital.

1. Statement - 1 is true, Statement - 2 is true and Statement - 2 is correct explanation for Statement - 1
2. Statement - 1 is true, Statement - 2 is true and Statement - 2 is NOT the correct explanation for Statement - 1
3. Statement - 1 is false, Statement - 2 is true
4. Statement - 1 is true, Statement - 2 is false