CBSE Class 11 Chemistry Structures of Atom Quiz 2

1. The electrons of the same orbitals can be distinguished by

A Principal quantum number B Azimuthal quantum number C Spin quantum number D Magnetic quantum number

2. Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:

A 12 and 4 B 12 and 5 C 16 and 4 D 16 and 5

3. A body of mass 10 mg is moving with a velocity of 100 ms. The wavelength of de-Broglie wave associated with it would be (Note: h = 6. 63 × 10Js)

A 6. 63 × 10 m B 6. 63 × 10 m C 6. 63 × 10 m D 6. 63 × 10 m

4. In Hydrogen atom, energy of first excited state is – 3. 4 eV. Then find out KE of same orbit of Hydrogen atom

A 3. 4 eV B 6. 8 eV C -13. 6 eV D +13. 6 eV

5. Which of the following sets of quantum numbers represents the highest energy of an atom?

A n = 3, l = 0, m = 0, s = + \(\frac {1}{2}\) B n = 3, l = 1, m = 1, s = + \(\frac {1}{2}\) C n = 3, l = 2, m = 1, s = + \(\frac {1}{2}\) D n = 4, l = 0, m = 0, s = + \(\frac {1}{2}\)

6. In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:

A 1 B 2 C -1 D -2

7. Which of the following statements does not form a part of Bohrs model of hydrogen atom?

A Energy of the electrons in the orbit is quantised B The electron in the orbit nearest the nucleus has the lowest energy C Electrons revolve in different orbits around the nucleus D The position and velocity of the electrons in the orbit cannot be determined simultaneously

8. Which of the following statements in relation to the hydrogen atom is correct?

A 3s orbital is lower in energy than 3p orbital B 3p orbital is lower in energy than 3d orbital C 3s and 3p orbitals are of lower energy than 3d orbital D 3s, 3p and 3d orbitals all have the same energy

9. A sub-shell with n = 6 , l = 2 can accommodate a maximum of

A 12 electrons B 36 electrons C 10 electrons D 72 electrons