Atomic Structure: JEE Main Chemistry Previous Year Questions

415 previous year questions from Atomic Structure. Here are the 25 most important ones; open any question for the correct answer and a full step-by-step solution.

1. $Uncertainity in the position of an electron (mass = 9.1 \times 1 0^{-31} Kg) moving with a velocity 300 m. se c^{-1}, Accurate up to 0.001%, will be: (h = 6.63 \times 1 0^{-34} \dots$
2. $Wavenumber for a radiation having 5800 A \dots wavelength is x \times 10 cm^{- 1} . The value of x is_____ (Integer answer)$
3. $For emission line of atomic hydrogen from n_{i} = 8 to n_{f} = n, the plot of wave number (v) against (\frac{1}{n ^{2}}) will be (The R\dots$
4. $Which of the following statements regarding the energy of the stationary state is true in the following one - electron systems?$
5. $When the azimuthal quantum number has the value of 2 , the number of orbitals possible are$
6. $What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3, l = 1, m_{l} = 0$
7. $The product of uncertainty in the position and uncertainty in velocity of a particle is 5.79 \times 10^{- 5} m^{2} s^{- 1} . If uncertainty in the position is\dots$
8. $What is the wave number of photon emitted during transition from orbit, n = 4 to n = 2 in hydrogen atom (R_{H} = 109677 cm^{- 1}) ?$
9. $For electrons in ' 2 s' and ' 2 p' orbitals, the orbital angular momentum values, respectively are:$
10. $An accelerated electron has a speed of 5 \times 1 0^{6} m s^{- 1} with an uncertainty of 0.02 . The uncertainty in finding its location while in motion is x \times 1 0^{- 9} m . The v\dots$
11. $Total number of ions from the following with noble gas configuration is_____\dots$
12. $How many electrons can fit in the orbital for which n = 3 and l = 1 ?$
13. $The de Broglie wavelength of an electron travelling with 20 % of velocity of light is\dots$
14. $In the sixth period, the orbitals that are filled are$
15. $If the energies of the two photons are in the ratio of 3 : 2, their wavelengths will be the ratio of$
16. $The atomic number of Ni and Cu are 28 and 29 respectively. The electronic configuration 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} represent\dots$
17. $A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, re\dots$
18. $Given below are two statements: Statement (I): A spectral line will be observed for a 2 p_{x} \to 2 p_{y} transition. Statement (II): 2 P_{x} and 2 p_{y} are\dots$
19. $Given below are two statements Statement I : According to Bohr's model of hydrogen atom, the angular momentum of an electron in a given stationary state is quantised. Sta\dots$
20. $Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ? (The Bohr radius is represented by a_{0}).$
21. $The wavelength of the radiation emitted, when in a hydrogen atom electron falls from infinity to stationary state 1, would be (Rydberg constant = 1.097 \times 1 0^{7} \dots$
22. $Arrange the following orbitals in decreasing order of energy? (A)n=3, l = 0, m = 0 (B) n = 4,1 = 0, m = 0 (C)n = 3, l=1, m=0 (D)n = 3,l = 2,m=1 The correct option for the\dots$
23. $The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a_{0} is Bohr radius]:$
24. $The electronic configuration of Pt (atomic number 78) is:$
25. $The energy of second orbit of hydrogen atom is - 5.45 \times 10^{- 19} J . What is the energy of first orbit of Li^{2 +} ion (in J)?$

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Atomic Structure: JEE Main Chemistry Previous Year Questions

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