Class 11 Chemistry Structure of Atom MCQs with Answers

Class 11 Chemistry Structure of Atom MCQs with Answers offer a targeted and comprehensive tool for Sainik School aspirants preparing for their chemistry exams. These multiple-choice questions are specifically tailored to the class 11 chemistry syllabus, focusing on the fundamental topic of the structure of the atom. With clear and concise answers provided, students can efficiently self-assess, identifying strengths and areas for improvement. A solid understanding of atomic structure is crucial, and these MCQs ensure thorough comprehension of essential concepts.

As students gear up for Sainik School entrance exams, practicing these MCQs not only aids in exam readiness but also enhances critical thinking and problem-solving skills. The content aligns with the broader goals of Sainik School education, emphasizing a holistic understanding of atomic structure principles. This resource serves as a strategic tool, helping students build a strong foundation for future academic endeavors and meet the specific requirements of Sainik School examinations

Q1. Number of angular nodes for 4d orbital is _.

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

Q2. Total number of orbitals associated with third shell will be __.

1. 2.
2. 4.
3. 9.
4. 3.

Q3. The radius of second Bohr’s orbits for hydrogen atoms is:

h = 6.6262 × 10⁻³⁴Js, m_e = 9.109 × 10−31kg, e change = 1.6021 × 10^19C

1. 1.65A˚
2. 4.76A˚
3. 0.529A^˚
4. 2.12A˚

Q4. The number of radial nodes for 3p orbital is __.Q60. The number of radial nodes for 3p orbital is __.

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

Q5. The radius of which of the following orbit is same as that of first orbit of hydrogen atom?

1. He⁺(n = 2)
2. L²⁺(n = 2)
3. Li²⁺(n = 3)
4. Be³⁺(n = 2)

Q6. On bombarding a beam of a-particles on the atom of the gold sheet, a few particles get deflected whereas most
of them go straight and remains undeflected. This is due to:

1. The nucleus occupy much smaller volume as compared to the volume of atom.
2. The force of repulsion on fast moving a-particles is very small.
3. The neutrons in the nucleus do not have any effect on a-particles.
4. The force of attraction on a-particles by the oppositely charged electron is not sufficient.

Q7. Electronic configuration of five elements I, II, III, IV, V is mentioned below.
In the above configuration element I, II, III, IV and V represent as:

1. C, N, O, F, Ne
2. Ne, F, O, N, C
3. C, O, N, Ne, F
4. O, C, F, Ne, V

Q8. The probability density plots of 1s and 2s orbitals are given in figure.
The density of dots in a region represents the probability density of finding electrons in the region.
On the basis of above diagram which of the following statements is incorrect?

1. 1s and 2s orbitals are spherical in shape.
2. The probability of finding the electron is maximum near the nucleus.
3. The probability of finding the electron at a given distance is equal in all directions.
4. The probability density of electrons for 2s orbital decreases uniformly as distance from the nucleus
   increases.

Q9. The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is:

Q10. Which of the following is responsible to rule out the existence of definite paths or trajectories of electrons?

1. Pauli’s exclusion principle.
2. Heisenberg’s uncertainty principle.
3. Hund’s rule of maximum multiplicity.
4. Aufbau principle.

Q11. In atom, an electron is moving with a speed of 600m/ s with an accuracy of 0.005%. Certainty with which the
position of the electron can be located is:

(h = 6.6 × 10^-34kg/ m²s^-1, mass of electron, em = 6.6 × 10^-31kg)

1. 1.52 × 10^-4m

2. 5.10 × 10^-3m

3. 1.92 × 10^-3m

4. 3.84 × 10^-3m

Q12. A ray of white light is spread out into a series of coloured bands of visible light are called:

1. Visible band.
2. Spectrum.
3. Electronic spectrum.
4. None of these.

Q13. Identify the pairs which are not of isotopes?

Q14. If E_A, E_B and E_C represent kine c energies of an electron, alpha par cle and proton respec vely and each moving with same de-Broglie wavelength, then choose the correct increasing representa on,

1. E_A = E_B = E_C

2. E_A > E_B > E_C

3. E_B > E_C > E_A

4. E_A < E_C < E_B

Q15. Which of the following is the energy of a possible excited state of hydrogen?

1. +13.6eV
2. -6.8eV
3. -3.4eV
4. +6.8eV