Atomic Structure - NEET/JEE /KEAM

15 Questions | By Vredutechkhd | Last updated: May 11, 2020 | Total Attempts: 47

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Atomic Structure - NEET/JEE /KEAM - Quiz

Each correct answer have 4 Marks Each wrong answers have -1 Mark Time - 15 Minutes ( 15 Questions )

Questions and Answers

1.

If the energy of a proton is given as 3.03 × 10^-19 J then, the wave length of the photon is:
- A.
  
  6.56nm
- B.
  
  65.6 nm
- C.
  
  656 nm
- D.
  
  0.656 nm
2.

In the photo-electron emission, the energy of the emitted electron is
- A.
  
  Greater than the incident photon
- B.
  
  Same as than of the incident photon
- C.
  
  Smaller than incident photon
- D.
  
  Proportional to the intensity of incident photon
3.

The electron was shown experimentally to have wave properties by
- A.
  
  De Broglie
- B.
  
  Davisson and Germer
- C.
  
  N. Bohr
- D.
  
  Schrodinger
4.

Which of the following is never true for cathode rays?
- A.
  
  They possess kinetic energy
- B.
  
  They are electromagnetic waves
- C.
  
  They produce heat
- D.
  
  They produce mechanical pressure
5.

According to the Bohr theory, which of the following transmissions in the hydrogen atom will give rise to the least energetic photon?
- A.
  
  N= 6 to n=1
- B.
  
  N=5 to n= 4
- C.
  
  N= 6 to n= 5
- D.
  
  N= 5 to n=3
6.

In hydrogen atom, energy of first excited state is -3.4 eV. Find out KE of the same orbit of Hydrogen atom
- A.
  
  +3.4 eV
- B.
  
  +6.8 eV
- C.
  
  -13.6 eV
- D.
  
  +13.6 eV
7.

According to Bohr's theory the energy required of for an electron in the Li²⁺ ion to be emitted from n= 2 state is (given that the ground state ionization energy of hydrogen atom is 13.6 eV)
- A.
  
  61.2 eV
- B.
  
  13.6 eV
- C.
  
  30.6 eav
- D.
  
  10.2 eV
8.

The Bohr orbit radius for the hydrogen atom(n=1) is approximately 0.530 A. The radius for the first excited state (n=2) orbit is (in A)
- A.
  
  0.13
- B.
  
  1.06
- C.
  
  4.77
- D.
  
  2.12
9.

The radius of hydrogen atom in the ground state is 0.53 A. The radius of Li²⁺ion (atomic number= 3) in a similar state is,
- A.
  
  0.17 A
- B.
  
  0.265 A
- C.
  
  0.53 A
- D.
  
  1.06 A
10.

If ionization potential for hydrogen atom is 13.6 eV, then ionization potential for He⁺ will be,
- A.
  
  54.4 eV
- B.
  
  6.8 eV
- C.
  
  13.6 eV
- D.
  
  24.5 eV
11.

If r is the radius of the first orbit, the radius of n^thorbit of H- atom is given by
- A.
  
  Rn²
- B.
  
  Rn
- C.
  
  R/n
- D.
  
  R²n²
12.

The spectrum of He is expected to be similar to that
- A.
  
  H
- B.
  
  Li⁺
- C.
  
  Na
- D.
  
  He⁺
13.

Two electrons occupying the same orbital are distinguished by
- A.
  
  Principal quantum number
- B.
  
  Magnetic quantum number
- C.
  
  Azimuthal quantum number
- D.
  
  Spin quantum number
14.

The correct set of four quantum numbers for the valence electron of rubidium atom (Z= 37) is,
- A.
  
  5,1,+1/2
- B.
  
  6,0,0 +1/2
- C.
  
  5,0,0 +1/2
- D.
  
  5,1, 0 +1/2
15.

The total number of atomic orbitals in fourth energy level of an atom is:
- A.
  
  8
- B.
  
  16
- C.
  
  32
- D.
  
  4