Atomic MCQ's - Gyanpoints

1. The ratio of the e/m values of a proton and an α-particle is

(a) 2 : 1 (b) 1 : 1 (c) 1 : 2 (d) 1 : 4

2. Which of the following pairs have identical values of e/m?

(a) A proton and a neutron

(b) A proton and deuterium

(d) An electron and γ-rays

3. The velocity of the de Broglie wave is given by

(a) $\displaystyle \frac{{{{C}^{2}}}}{v}$

(b) $\displaystyle \frac{{hv}}{{mc}}$

(d) $\displaystyle v\lambda$

4. The momentum of a hydrogen atom is given by

(a) $\displaystyle p=\frac{{hv}}{c}$

(b) $\displaystyle p=\frac{{hv}}{{m{{c}^{2}}}}$

(d) $\displaystyle p=mvr$

5. For an electron, the product vn (velocity v, principal quantum number n) will be independent of the

(a) principal quantum number

(b) velocity of the electron

(d) frequency of its revolution

6. The wavelength of the third line of the Balmer series for a hydrogen atom is

(a) $\displaystyle \frac{{21}}{{100{{R}_{\infty }}}}$

(b) $\displaystyle \frac{{100}}{{21{{R}_{\infty }}}}$

(d) $\displaystyle \frac{{100{{R}_{\infty }}}}{{21}}$

7. The maximum number of electrons in a subshell is given by the expression

(a) $\displaystyle 4l-2$

(b) $\displaystyle 4l+2$

(d) $\displaystyle 2{{n}^{2}}$

8. The total number of subshells in the nth energy level is

(a) n² (b) 2n² (c) n – 1 (d)n

9. When the value of the azimuthal quantum number is 3, the maximum and the minimum values of the spin multiplicities are

(a) 4, 3 (b) 8, 1 (c) 1, 3 (d) 8, 2

10. If the value of the principal quantum number is 3, the maximum number

of values the magnetic quantum number can have is

(a) one (b) four

11. The Pauli exclusion principle is not applicable to

(a) electrons (b) positrons (c) photons (d) protons

12. The total number of orbitals in a shell with principal quantum number n is

(a) 2n (b) 2n² (c) n² (d) n + 1

13. If m = magnetic quantum number and l = azimuthal quantum number, then

(a) m = l + 2 (b) m = 2l² + 1

(d) l = 2m + 1

14. The configuration [Ar]3d¹⁰4s²4p¹ is similar to that of

(a) carbon (b) oxygen

15. Which of the following sets of orbitals is arranged in the correct order of increasing energy?

(a) 3d < 4s < 4p < 6s < 4d (b) 2s < 3d < 4p < 4f < 1s

16. The number of spherical nodes in 3p orbitals is

(a) one (b) three

17. After np orbitals are filled, the next orbital filled will be

(a) (n + 1) s (b) (n + 2)p

18. The electronic configuration of Fe³⁺ is

(a) [Ar]3d⁵4s¹ (b) [Ar]3d⁶4s⁰

19. The number of unpaired electrons in Mn⁴⁺(Z = 25) is

(a) four (b) two

20. The angular distribution functions of all orbitals have

(a) l nodal surfaces (b) l--1 nodal surfaces

Atomic MCQ’s

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