Atomic Structure : Jee Mains Questions

Atomic Structure : Jee Mains Questions with Answers

Atomic Structure : Jee Mains Questions with Answers

These are JEE Mains questions for chapter Atomic Structure from previous year papers .

  1. The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately (Planck's constant, h = 6.63 x 10 -34 Js)
    (1) 10 -31 metre(2) 10 -16 metres (3) 10 -25 metres(4) 10-33 metres                           (MAINS-2003)

    Ans :-- (4)

  2. In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen
    1.)     5→2               2.)  4→1                 3.)  2→5                        4.)  3→2                 (MAINS-2003)

    Ans :-- (1)

  3. The orbital angular momentum for an electron revolving in an orbit is given by √l(l+1) h/2π .This momentum for an s-electron will be given by
    1.)     Zero   2.) h/2π   3.) √2 h/2π   4.) +h/2 x 2π

    27t

    (MAINS-2003)

    Ans :-- (1)

  4. The wavelength of the radiation emitted,  when in hydrogen atom electron falls from infinity to stationary state 1, would be  (Rydberg constant = 1.097 x 10 m)

    (I) 91 nm         (2) 9.1 x 10-8 nm

    (3) 406 nm           (4) 192 nm                                                                                             (MAINS-2004)

    Ans :-- (1)

  5. Consider the ground state of Cr atom (Z = 24). The number of electrons with the azimuthal quantum numbers I=1 and 2 are respectively:

    (1) 12 and 4                                                                            (2) 16 and 5                                     

    (3) 16 and 4                                                                  (4) 12 and 5                                             (MAINS-2004)

    Ans :-- (4)

  6. Which of the following sets of quantum numbers is correct for an electron in 4f orbital?

    (1) n = 4, I =3, m = +4, s = +1/2                                     (2) n = 3, 1 = 2, m =-2, S = +1/2

    (3) n=4 , I=3 ,m =+1, s= + ½                           (4)n =4, I=4, m=-4 , S = -1/2            (MAINS-2004)

    Ans :-- (3)

  7. Which of the following statements in relation to the hydrogen atom is correct?

    (1)  3s orbital is lower in energy than 3p orbital

    (2)  3p orbital is lower in energy than 3d orbital

    (3)  3s and 3p orbitals are of lower energy than 3d orbital  

    (4)  3s, 3p and 3d orbitals all have the same energy                                                  (MAINS-2005)

    Ans :-- (4)

  8. 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 field and electric fields?

    (1) (1) and (2)                                                                    (2) (2) and (3)

    (3) (3) and (4)                                                                    (4) (4) and (5)                  (MAINS-2005)

    Ans :-- (4)

  9. Uncertainty in the position of an electron (mass = 9.1 x 10-31 kg) moving with a velocity 300 ms-I , accurate upto 0.001%, will be

      (1) 19.2 x 10-2 m                                                              (2) 5.76 x 10-2 m

      (3) 1.92 x 10-2 m                                                               (4) 3.84 x 10-2 m           (MAINS-2006)

    (h = 6.63 x 10-34 Js)

    Ans :-- (3)

  10. According to Bohr's theory, the angular momentum of an electron in 5th orbit is 
    (1) 25 h/ℼ   (2) 1.0 h /ℼ  (3) 10 h/ℼ  (4)  2.5 h /ℼ                                (MAINS-2006)

    Ans :-- (4)

  11. Which of the following sets of quantum numbers represents the highest energy of an atom?
    (1) n=3 , I =1 , m=1 , s = +1/2
    (2) n=3 , I = 2 , m = 1 , s= +1/2
    (3) n=4 , I = 0 , m = 0 , s= +1/2
    (4) n=3 , I = 0 , m = 0 , s= +1/2                                                                               (MAINS-2007)

    Ans :-- (2)

  12. The ionization enthalpy of hydrogen atom is 1.312 x 106 J mol-1. The energy required to excite the

    electron in the atom from n = 1 to n = 2 is

    (1)     8.51 x 105 J mol-1

    (2)     6.56 x 105 J mol-1

    (3)     7.56 x 105 J mol-1

    (4)     9.84 x 105 J mol-1                                                                                             (MAINS-2008)

    Ans :-- (4)

     

  13. Calculate the wavelength (in nanometer) associated with a proton moving at 1.0 x 103ms-1

    (Mass of proton = 1.67 x 10 -27 kg and h=6.63x10-34 Js) :

    (1)     0.032 nm

    (2)     0.40 nm

    (3)     2.5 nm              

    (4)     14.0 nm                                                                                                             (MAINS-2009)

    Ans :-- (2)

  14. In an atom, an electron is moving with a speed of 600m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6x10 -34 kg m2s-1 , mass of electron, em = 9.1 x 10-31 kg)

    (1)     1.52 x 10-4 m

    (2)     5.10 x 10 -3 m

    (3)     1.92 x 10-3 m

    (4)     3.84 x 10 -3 m                                                                                                   (MAINS-2009)

    Ans :-- (3)

  15. The energy required to break one mole of CI—CI bonds in Cl2 is 242 kJ mol-1 .The longest wavelength of light capable of breaking a a single  Cl — Cl bond is (c = 3 x 108 ms-1 and NA = 6.02 x 10 23 mol-1 ) 
    (1) 594 nm                                                                    (2) 640 nm
    (3) 700 nm                                                                 (4) 494 nm                               (MAINS-2010)

    Ans :-- (4)

  16. Ionisation energy of He is 19.6 x 10-18 J atom-I. The energy of the first stationary state (n = 1) of Li2+ is

    (1) 4.41 x 10-16 J atom-1                                                                       (2) —4.41 x 10-17 J atom-1

    (3) -2.2 x 10-15 J atom-1                                                    (4) 8.82 x 10-17 J atom -1(MAINS-2010)

    Ans :-- (2)

  17. The frequency of light emitted for the transition n=4 to n=2 of He⁺ is equal to the transition in H atom corresponding to which of the following ?
    (1)  n=4 to n=3
    (2)  n=3 to n=1
    (3)  n=2 to n=1
    (4)  n=3 to n=2                                                                                                           (MAINS-2011)

    Ans :-- (3)

  18. The electrons identified by quantum numbers n and l:
    (1) n=4 , I=1      (2) n=4 , I=0  (3) n=3 , I=2  (4) n=3 , I=1
    Can be placed in order of increasing energy as:
    (1) (3) < (4) < (2) < (1)
    (2) (4) < (2) < (3) < (1)
    (3) (2) < (4) < (1) < (3)
    (4) (1) < (3) < (2) < (4)                                                                                              (MAINS-2012)

    Ans :-- (2)

  19. Energy of an electron is given by E = —2.178 x 10 -18 J ( Z2/n2). Wavelength of light required to excite

    an electron in an hydrogen atom from level n = I to n = 2 will be (h = 6.62 x 10-34 Js and c = 3.0 x 108 ms-1)

     (1) 2.816 x 10                                       (2) 6.500 x 10-7 m

     (3) 8.500 x 10 -7 m                                (4) 1.214 x 10-7 m                    (MAINS-2013) 

    Ans :-- (4)

  20. The correct set of four quantum numbers for the valence elections of rubidium atom (Z= 37) is:
    (1)     5 ,1 ,1 ,+1/2
    (2) 5 ,0 ,1 ,+1/2
    (3) 5 ,0 ,0 ,+1/2
    (4) 5 ,1 ,0 ,+1/2                                                                                                          (MAINS-2014)

    Ans :-- (3)

  21. Which of the following is the energy of a possible excited state of hydrogen?
    (1) -6.8 eV       (2) -3.4 eV   (3) +6.8 eV   (4) -13.6 eV                                                 (MAINS-2015)

    Ans :-- (2)

  22. A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/ 𝜆 (where 𝜆 is wavelength associated with electron wave) is given by:

    (1)  2meV   (2)  √meV   (3)  √2meV   (4)  meV                                                           (MAINS-2016)

    Ans :-- (3)

  23. The radius of the second Bohr orbit for hydrogen atom is:
    (Planck's Const. h = 6.6262 x 1034 Js; mass of electron = 9.1091 x 10-31 kg; charge Of e = 1.60210 x 10-19 C; permittivity of vacuum €0 = 8.854185 x 10-12 kg -1 m -3 A2 )

     (1)4.76 Å               (2) 0.529Å                (3) 2.12Å        (4) 1.65Å                            (MAINS-2017)

    Ans :-- (3)
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