Structure of Atom

The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

• 4, 12, 32

• 4, 16, 30

• 4, 16, 32

• 4, 32, 64

Which one of the following transitions of an electron in hydrogen atom emits radiation of the lowest wavelength?

• n₂ = ∞ to n₁=2

• n₂= 4 to n₁ =3

• n₂= 2 to n₁ =1

• n₂ = 5 to n₁=3

The electron affinity values of elements A, B, C and D are respectively -135, -60, -200 and -348 kJ mol^-1. The outer electronic configuration of element B is

• 3s² 3p⁵

• 3s² 3p⁴

• 3s² 3p³

• 3s² 3p²

The basis of quantum mechanical model of an atom is

• angular momentum of electron

• quantum numbers

• dual nature of electron

• black body radiation

The number of 2p electrons having spin quantum number s =-1/2 are

• 6

• 0

• 2

• 3

If the energies of the two photons in the ratio of 3 : 2, their wavelength will be in the ratio of

• 2 : 3

• 9 : 4

• 3 : 2

• 1 : 2

For a Bohr atom angular momentum M of the electron is : (n = 0, 1, 2......)

• $\frac{{\mathrm{nh}}^2}{4\mathrm{\pi }}$

• $\frac{{\mathrm{n}}^2{\mathrm{h}}^2}{4\mathrm{\pi }}$

• $\frac{\sqrt{{\mathrm{nh}}^2}}{4\mathrm{\pi }}$

• $\frac{\mathrm{nh}}{2\mathrm{\pi }}$

Which of the following sets of qunatum numbers correct?

• n =5, l=4, m=0, s=+1/2

• n= 3, l=3, m=+3, s= +1/2

• n=6, l=0, m=+1, s= =1/2

• n=4, l= 2, m=+2, s=0

An electron from one Bohr stationary orbit can go to next higher orbit

• by emission of electromagnetic radiation

• by absorption of any electromagnetic radiation

• by absorption of electromagnetic radiation of particular frequency

• without emission or absorption of electromagnetic radiation

Which one of the following complexes is an outer orbital complex?

(Atomic number of Mn = 25; Fe = 26; Co = 27 and Ni = 28)

• [Fe(CN)₆]^4-

• [Mn(CN)₆]^4-

• [Co(NH₃)₆]³⁺

• [Ni(NH₃)₆]²⁺