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ATOMIC STRUCTURE QUIZ-3

Dear Readers,
As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 


Q1. The radius of second stationary orbit in Bohr's atoms is R. The radius of third orbit will be:
  •  3R
  •  9R
  •  2.25R
  •  R/3
Solution
r_n=r_1×n^2 ∴r_3/r_2 =9/4

Q2.According to (n+l) rule after completing 'np' level the electron enters to:
  •  (n-1)d
  •  (n+1)s
  •  nd
  •  (n+1)p
Solution
After filling up of electron in np,the next electron occupies (n+1)s level.

Q3.  Which orbital is dumb-bell shaped?
  •   s
  •  2p_y
  •  3s
  •  3d_z^2
Solution
p-orbitals are dum-bell type.

Q4. Which of the following is not permissible arrangement of electrons in an atom?
  •  n=3,l=2,m=-2,s=-1/2
  •  n=4,l=0,m=0,s=-1/2
  •  n=5,l=3,m=0,s=+1/2
  •  n=3,l=2,m=-3,s=-1/2
Solution
For l=2,m can have values -2,-1,0,+1,+2

Q5.Line spectra is characteristic of:
  •  Atoms
  •  Molecules
  •  Radicals
  •  Ions
Solution
 A characteristic of each element is its line spectrum.

Q6. In which of the orbit of He^+, the angular momentum of the electron in h/2Ï€?
  •  First orbit
  •  Second orbit
  •  Third orbit
  •  Fourth orbit
Solution
Angular momentum in an orbit =nh/2Ï€ if n=1, it will be h/2Ï€.

Q7.What is the charge in coulomb on Fe^(3+) ion?
  •  4.8×10^(-19) C
  •  1.6×10^(-19) C
  •  3.2×10^(-19) C
  •  6.4×10^(-19) C
Solution


Q8.The electron possesses wave properties was shown experimentally by:
  •  Bohr
  •  de brogile
  •  Davission and germer
  •  Schrodinger
Solution
During the experimental verification of de Broglie equation, Davission and Germer confirmed wave nature of electron. For a given shell, say n=2,l=0 ∴m=0 l=1 ∴m=-1,0,+1

Q9.The ground state electronic configuration of nitrogen atom can be represented as
  •  

  •  

  •  

  •  All of the above
Solution


Q10. The maximum numer of unpaired electrons present in 4f-energy level is:
  •  5
  •  7
  •  10
  •  6
Solution
f-orbital possesses 7 subshells and thus, maximum number of unpaired electrons =7.

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