All questions of Atomic Structure for JEE Exam

• a)
  Infra red
• b)
  ultraviolet
• c)
  microwave
• d)
  X-ray

• a)
  2.50 × 10^-5
• b)
  0.0400
• c)
  25.0
• d)
  12.0

• a)
  Principal quantum number
• b)
  Azimuthal quantum number
• c)
  Spin quantum number
• d)
  Magnetic quantum number

• a)
  directly, inversely
• b)
  inversely, directly
• c)
  inversely, inversely
• d)
  directly, directly

Magnetic moments of the following isoelectronic species (24 electrons) are in order

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  3d
• b)
  2p
• c)
  Both (A) and (B)
• d)
  none of these

• a)
  2.5 × 10^-15
• b)
  5.58 x 10¹⁵ HZ
• c)
  1.8 × 10^-16
• d)
  5.6 × 10¹⁵

• a)
  6.0 ×10^-23
• b)
  4.5 ×10²⁵
• c)
  4.5 × 10^-25
• d)
  2.2 ×10^-26

• a)
  n=3, l=0
• b)
  n=3, l=1
• c)
  n=2, l=0
• d)
  n=2, l=1

• a)
  Spherical node appear
• b)
  Electron charge density is highest in the vicinity of the nucleus
• c)
  Electron density drops to zero after maximum probability is reache
• d)
  Electron density rises to second highest valu

• a)
  0, 1, 2, 3
• b)
  3, -2, -1, +1, +2, +3
• c)
  0, -1, -2, -3
• d)
  3, -2, -1, 0, +1, +2, +3

• A:

  

• B:

  

• C:

  

• D:

  

The answer is d.

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• a)
  1.54 × 10^-3
• b)
  649
• c)
  932
• d)
  1.07 × 10⁶

• a)
  2
• b)
  ½
• c)
  ¼
• d)
  4

• a)
  | | measures the electron probability density at point in an atom
• b)
  and | | vary as a function of the three coordinates r (radial), θ and ( (angular part)
• c)
  Angular wave function ‘θ’ depends an only l and m, and is independent of n
• d)
  All of the above are correct statements

• a)
  m
• b)
  n
• c)
  l
• d)
  s

• a)
  Photoelectrons
• b)
  Proton
• c)
  Electron
• d)
  Neutron

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  O₂^2-
• b)
  O₂
• c)
  O₂⁺
• d)
  O₂^-

• a)
  3p
• b)
  3d
• c)
  3s
• d)
  equal

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  The electronic configuration Cr is [Ar] 3d5,4s1
• b)
  Spin quantum number of K (19) can have value - 1/2
• c)
  Any p-orbital can have maximum of two electrons
• d)
  A s-orbital can have maximum of two electron

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  6.0 cm
• b)
  4.8 cm
• c)
  2.4 cm
• d)
  1.2 cm

• a)
  1s
• b)
  2p
• c)
  3s
• d)
  3d

• a)
  Heisenberg’s Uncertainty Principle
• b)
  Einstein’s mass energy relation
• c)
  Schrodinger’s Wave Equation
• d)
  Hamiltonian Operator

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  It is defined as the number of waves which pass through a particular point in one second
• b)
  It is defined as the number of wavelengths per unit length
• c)
  It is defined as the distance between two neighbouring crests or troughs of wave
• d)
  It is the distance travelled by a wave in one second

• a)
  2 and 0
• b)
  0 and 2
• c)
  1 and 2
• d)
  2 and 1

• a)
  De Broglie
• b)
  Einstein
• c)
  Bohr
• d)
  Planck

• a)
  
• b)
  
• c)
  
• d)
  All of these

• a)
  the spectrum of hydrogen atom only
• b)
  the spectrum of an atom or ion containing one electron only
• c)
  the spectrum of hydrogen molecule
• d)
  the solar spectrum

For x -axis , wave function () can be written as

Thus, Schrodinger wave equation along x-axis can be written as : 

• a)
  
• b)
  
• c)
  
• d)
  None of the above

The Schrodinger wave equation for H-atom is 

where, a₀ is Bohr’s radius. If radial node in 2s is at distance r₀, then

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  9.62 × 10¹²
• b)
  1.04 ×10¹³
• c)
  2.44 × 10¹⁶
• d)
  3.69

In the following pair, each has two orbitals I and II. Select the ones in which II experiences larger effective nuclear charge than l

• a)
  a
• b)
  b
• c)
  c
• d)
  d

• a)
  12 and 4
• b)
  12 and 5
• c)
  16 and 4
• d)
  16 and 5

• a)
  10,000
• b)
  It depends on wavelength.
• c)
  3.00 × 10⁸
• d)
  186,000

Hamiltonian operator is the sum of two energy operators. These are

• a)
  mechanical and potential
• b)
  kinetic and mechanical
• c)
  kinetic and potential
• d)
  thermal and potential

at any point is proportional to

• a)
  the probability of finding the particle at that point
• b)
  energy of the electron
• c)
  radius of the orbital
• d)
  (radius)^-1 of the orbital

• A:

  Both A and B are for 1s

• B:

  Both A and B are for 2s 

• C:

  A is for 2s and B is for 1s

• D:

  A is for 1s and B is for 2s

The answer is d.

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  
• b)
  
• c)
  
• d)
  all of these

The potential energy of the electron present in the ground state of

ion is represented by:

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  Kinetic energy of an electron in an orbit is half of magnitude of its potential energy.
• b)
  Kinetic energy of an electron in an orbit is equal to the magnitude of its potential energy.
• c)
  Total energy of an electron is negative of its kinetic energy.
• d)
  Potential energy of an electron in an orbit is equal to

  .

Direction (Q. Nos. 18) Choice the correct combination of elements and column I and coloumn II  are given as option (a), (b), (c) and (d), out of which ONE option is correct.

Q. Match the entries in Column I with correctly related quantum number(s) in Column II 

• a)
  a
• b)
  b
• c)
  c
• d)
  d

Calculate the velocity of ejected electron from the metal surface when light of frequency fall on the metal surface and the threshold frequency is for metal ?

• a)
  
• b)
  
• c)
  
• d)
  

• a)
  
• b)
  
• c)
  
• d)
  

Following suborbits with values of n and l are given

Q. Increasing order of energy of these suborbits is

• a)
  IV < III < II < I
• b)
  IV < III < I < II
• c)
  IV < II < III < I
• d)
  I < III < II < IV