Topper Assignment-01 _ Atomic Structure __ Yakeen 2.0 2024 (Legend).pdf

1 YAKEEN 2.0 Atomic Structure Topper Assigment-01 1....

1 YAKEEN 2.0 Atomic Structure Topper Assigment-01 1. Which of the following has maximum energy: 7. According to the Bohr Theory, which of the following transitions in the hydrogen atom will give (1) rise to the least energetic photon? (1) n = 5 to n = 3 (2) n = 6 to n = 1 (2) (3) n = 5 to n = 4 (4) n = 6 to n = 5 (3) 8. Smallest wavelength occurs for : (1) Lyman series (4) (2) Balmar series (3) Paschen series 2. The value of planck’s constant is 6.63 × 10–34 Js. (4) Brackett series The velocity of light is 3.0 × 108 ms–1. Which value is closest to the wavelength in metres of a quantum 9. Which of the following is wrong for Bohr model ? of light with frequency of 8 × 1015 s–1. (1) It establishes stability of atom (1) 3 × 107 (2) 2 × 10–25 (2) It is contradicted with Heisenberg uncertainity (3) 5 × 10 –18 (4) 3.75 × 10–8 principle (3) It explain the concept of spectral lines 3. The frequency of radiation emitted when the (4) e– behaves as particle & wave electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H = 2.18 × 10–18 10. The correct set of four quantum numbers for the J atom–1 and h = 6.625 × 10–34 Js) valence electron of rubidium atom (Z = 37) is :- (1) 1.03 × 1015 s–1 (2) 3.08 × 1015 s–1 (1) 5, 0, 0, + 1/2 (2) 5, 1, 0, + 1/2 (3) 2.00 × 1015 s–1 (4) 1.54 × 1015 s–1 (3) 5, 1, 1, + 1/2 (4) 6, 0, 0 + ½ 4. If uncertainty in position and momentum are equal, 11. The orbital angular momentum of a p-electron is then uncertainty in velocity is? given as :- h 1 h 3h h (1) (2) (1) (2) 6. π 2m π 2π 2π h 1 h h h (3) (4) (3) (4) 3. 2π m π 2π 2π 5. The total number of atomic orbitals in fourth energy 12. Threshold frequency of a metal is 5 × l013 sec–1 upon level of an atom is: which 1 × 10+14 sec-1 frequency light is focused then (1) 8 (2) 16 maximum kinetic energy of emitted electron :- (3) 32 (4) 4 (1) 3.3 × 10–21 (2) 3.3 × 10–20 (3) 6.6 × 10–21 (4) 6.6 × 10–20 6. The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their nh 13. In Bohr's orbit indicates :- wavelengths i.e., λ1 and λ2 will be: 2π (1) λ1 = λ2 (2) λ1 = 2λ2 (1) Momentum 1 (2) Kinetic energy (3) λ1 = 4λ2 (4) λ1 = λ 2 (3) Potential energy 2 (4) Angular momentum  2 14. Two electrons occupying the same orbital are 21. Which of the following conclusions could not be distinguished by derived from Rutherford’s α-particle scattering (1) Principal quantum number experiement? (2) Magnetic quantum number (1) Most of the space in the atom is empty. (3) Azimuthal quantum number (2) The radius of the atom is about 10–10 m while (4) Spin quantum number that of nucleus is 10–15 m. (3) Electrons move in a circular path of fixed 15. How many electrons can fit in the orbital for which energy called orbits. n = 3 and 1 = 1? (4) Electrons and the nucleus are held together by electrostatic forces of attraction. (1) 10 (2) 14 (3) 2 (4) 6 22. Which of the following options does not represent ground state electronic configuration of an atom? 16. Bohr's model is applicable to explain :- (1) 1s2 2s2 2p6 3s2 3p6 3d8 4s2 (1) Zeeman effect (2) 1s2 2s2 2p6 3s2 3p6 3d9 4s2 (2) Stark effect (3) 1s2 2s2 2p6 3s2 3p6 3d10 4s1 (3) Bond formation of H2 (4) 1s2 2s2 2p6 3s2 3p6 3d5 4s1 (4) Hydrogen spectrum 23. Which of the following statement is not correct 17. For H-spectrum, electron transition takes place from about the characteristics of cathode rays? n = 5 to n = 2 then emitted wave length of photon is (1) They start from the cathode and move towards 434 nm. The wave length of photon in electron the anode. transition from n = 4 to n = 2 will be:- (2) They travel in straight line in the absence of an (1) 586.16 nm (2) 48.608 nm external electrical or magnetic field. (3) 486 nm (4) 400.16 nm (3) Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube. 18. The statement, an atom possesses a spherical shape (4) Characteristics of cathode rays depend upon the in which the positive charge is uniformly distributed nature of gas present in the cathode ray tube. and the electrons are embeded into it such a manner as to give stable arrangement was given by :- 24. Which of the following properties of atom could be (1) Thomson's atomic model explained correctly by Thomson Model of atom? (2) Rutherford's atomic model (1) Overall neutrality of atom. (3) Bohr's atomic model (2) Spectra of hydrogen atom. (4) Chadvic atomic model (3) Position of electrons, protons and neutrons in atom. 19. 4d, 5p, 5f and 6p orbitals are arranged in order of (4) Stability of atom. decreasing energy. The correct option is- (l) 5f > 6p > 5p > 4d 25. Two atoms are said to be isobars if. (2) 6p > 5f > 5p > 4d (1) they have same atomic number but different (3) 6p > 5f > 4d > 5p mass number. (4) 5f > 6p > 4d > 5p (2) they have same number of electrons but different number of neutrons. 20. Which of the following series of transitions in the (3) they have same number of neutrons but spectrum of hydrogen atom fall in visible region? different number of electrons. (1) Lyman series (4) sum of the number of protons and neutrons is same but the number of protons is different. (2) Balmer series (3) Paschen series 26. Number of angular nodes for 4d orbital is (4) Brackett series __________. (1) 4 (2) 3 (3) 2 (4) 1  3 27. The pair of ions having same electronic 31. Statement-1: All isotopes of a given element show configuration is __________. the same type of chemical behaviour. (1) Cr3+, Fe3+ (2) Fe3+, Mn2+ Statement-2: The chemical properties of an atom (3) Fe3+, Co3+ (4) Sc3+, Cr3+ are controlled by the number of electrons in the 28. Match the following species with their aotm. corresponding ground state electronic configuration. (1) If both statements are correct and the statement- Column-I Column-II 2 is the correct explanation of the statement-1. Atom / Ion Electronic configuration (1) Cu (a) 1s2 2s2 2p6 3s2 3p6 3d10 (2) If both statements are correct and the statement- (2) Cu2+ (b) 1s22s22p63s23p63d104s2 2 is not the correct explanation of the (3) Zn 2+ (c) 1s22s22p63s23p63d104s1 statement-1. (4) Cr3+ (d) 1s2 2s2 2p6 3s2 3p6 3d9 (3) If statement-1 is correct but statement-2 is (e) 1s2 2s2 2p6 3s2 3p6 3d3 wrong (1) (1)-(c); (2)-(d); (3)-(a); (4)-(e) (2) (1)-(b); (2)-(a); (3)-(c); (4)-(d) (4) If both statements are wrong. (3) (1)-(c); (2)-(e); (3)-(a); (4)-(d) (4) (1)-(d); (2)-(c); (3)-(b); (4)-(a) 32. Statement-1: Black body is an ideal body that emits 29. Match the quantum numbers with the information and absorbs radiations of all frequency. provided by these. Statement-2: The frequency of radiation emitted by Column-I Column-II Quantum number Information provided a body goes from a lower frequency to higher (1) Principal quantum (a) orientation of the frequency with an increase in temperature number orbital (2) Azimuthal quantum (b) energy and size of (1) If both statements are correct and the statement- number orbital 2 is the correct explanation of the statement-1. (3) Magnetic quantum (c) spin of electron number (2) If both statements are correct and the statement- (4) Spin quantum number (d) shape of the orbital 2 is not the correct explanation of the (1) (1)-(a); (2)-(c); (3)-(b); (4)-(e) statement-1. (2) (1)-(b); (2)-(d); (3)-(a); (4)-(c) (3) (1)-(c); (2)-(e); (3)-(a); (4)-(d) (3) If statement-1 is correct but statement-2 is (4) (1)-(d); (2)-(c); (3)-(b); (4)-(a) wrong 30. Match the following rules with their statements: (4) If both statements are wrong. Column-I Column-II Rules Statements (1) Hund’s Rule (a) No two electrons in an atom 33. Statement-1: It is impossible to determine the exact can have the same set of four position and exact momentum of an electron quantum numbers. (2) Aufbau (b) Half-filled and completely simultaneously. Principle filled orbitals have extra Statement-2: The path of an electron in an atom is stability clearly defined. (3) Pauli (c) Pairing of electrons in the Exclusion orbitals belonging to the same (1) If both statements are correct and the statement- Principle subshell does not take place until each orbital is singly 2 is the correct explanation of the statement-1. occupied. (2) If both statements are correct and the statement- (4) Heisenberg’s (d) It is impossible to determine Uncertainty the exact position and exact 2 is not the correct explanation of the Principle momentum of a subatomic statement-1. particle simultaneously. (e) In the ground state of atoms, (3) If statement-1 is correct but statement-2 is orbitals are filled in the order wrong of their increasing energies. (1) (1)-(a); (2)-(c); (3)-(b); (4)-(e) (4) If both statements are wrong. (2) (1)-(b); (2)-(a); (3)-(c); (4)-(d) (3) (1)-(c); (2)-(e); (3)-(a); (4)-(d) (4) (1)-(d); (2)-(c); (3)-(b); (4)-(a)  4 34. Statement-1: The angular momentum of d-orbitals (1) If both A and R are correct and R is the correct h reason of A. is 6. 2π (2) If both A and R are correct and R is not the Statement-2: Angular momentum of electron in correct reason of A. nh (3) A is correct R is wrong orbit is m𝑣𝑣r =. 2π (4) A is wrong R is correct. (1) If both statements are correct and the statement- 2 is the correct explanation of the statement-1. 38. Assertion A: 2p-orbitals do not have any spherical (2) If both statements are correct and the statement- node. 2 is not the correct explanation of the Reason R: The number of spherical nodes in p- statement-1. orbitals is given by (n – 2), where n is principal (3) If statement-1 is correct but statement-2 is quantum number. wrong (1) If both A and R are correct and R is the correct (4) If both statements are wrong. reason of A. (2) If both A and R are correct and R is not the 35. Statement-1: Angular momentum of the electron in correct reason of A. 2h the orbit which has four subshell is. (3) A is correct R is wrong π (4) A is wrong R is correct. Statement-2: Angular momentum of electron is quantized. (1) If both statements are correct and the statement- 39. Assertion A: In fourth energy level, there is no g- 2 is the correct explanation of the statement-1. subshell. (2) If both statements are correct and the statement- Reason R: g-subshell has nine orbitals. 2 is not the correct explanation of the (1) If both A and R are correct and R is the correct statement-1. reason of A. (3) If statement-1 is correct but statement-2 is (2) If both A and R are correct and R is not the wrong correct reason of A. (4) If both statements are wrong. (3) A is correct R is wrong (4) A is wrong R is correct. 36. Assertion A: s-orbital cannot accommodate more than two electrons. 40. Assertion A: The two electrons present in the first Reason R: s-orbital are extremely poor shielders. energy level cannot have same value of spin (1) If both A and R are correct and R is the correct quantum number. reason of A. Reason R: There is only one orbitals in the first (2) If both A and R are correct and R is not the energy leve. correct reason of A. (1) If both A and R are correct and R is the correct (3) A is correct R is wrong reason of A. (4) A is wrong R is correct. (2) If both A and R are correct and R is not the correct reason of A. 37. Assertion A: In H atom, the energy of 3d-level is (3) A is correct R is wrong smaller than 4s-level. (4) A is wrong R is correct. Reason R: An orbital with lower value of (n + 1) has energy smaller than the orbital with larger value of (n + 1)  5 41. Assertion A: In multielectron atoms, such as 45. Assertion A: In a multielectron atom, energy of 4s sodium, all the subshell of a particular energy level orbitals is less than that of 3d. have different energies. Reason R: An electron is 4s orbital experiences Reason R: Electrons in different subshells feel greater effective nuclear charge (Zeff) than an different screening effect. electron in 3d orbital. (1) If both A and R are correct and R is the correct (1) If both A and R are correct and R is the correct reason of A. reason of A. (2) If both A and R are correct and R is not the correct reason of A. (2) If both A and R are correct and R is not the (3) A is correct R is wrong correct reason of A. (4) A is wrong R is correct. (3) A is correct R is wrong (4) A is wrong R is correct. 42. Assertion A: The maximum value of m for an electron in third energy level is 3. Reason R: The maximum value of 𝑙𝑙 for an electron 46. Assertion: The free gaseous Cr atom has six in third energy level is 2. unpaired electrons (1) If both A and R are correct and R is the correct reason of A. Reason: Half-filled s-orbitals has greater stability. (2) If both A and R are correct and R is not the (1) Both assertion and reason are correct, and the correct reason of A. reason is the correct explanation for the (3) A is correct R is wrong assertion. (4) A is wrong R is correct. (2) Both assertion and reason are correct, and the reason is not the correct explanation for the 43. Assertion A: Black body is an ideal body that emits assertion. and absorbs radiations of all frequencies. Reason R: Behaviour of black body radiation can be (3) The assertion is true, but the reason is false. explained on the basis of quantum theory of (4) The assertion is false, but the reason is true. radiation. (1) If both A and R are correct and R is the correct reason of A. 47. Assertion: The radial probability distribution curves (2) If both A and R are correct and R is not the of 1s, 2p and 3d orbitals are identical in shape. correct reason of A. Reason: The number of planar nodes present in (3) A is correct R is wrong these orbitals is different. (4) A is wrong R is correct. (1) Both assertion and reason are correct, and the reason is the correct explanation for the 44. Assertion A: Isotopes of an element exhibit same assertion. type of chemical behaviour. Reason R: The chemical properties of an atom (2) Both assertion and reason are correct, and the depend upon the number of electrons in the atom. reason is not the correct explanation for the (1) If both A and R are correct and R is the correct assertion. reason of A. (3) The assertion is true, but the reason is false. (2) If both A and R are correct and R is not the (4) The assertion is false, but the reason is true. correct reason of A. (3) A is correct R is wrong (4) A is wrong R is correct.  6 48. Assertion: K.E. of two subatomic particles, having 50. Assertion: Isotopes of an element have almost same de-Broglie’s wavelength is not same. similar chemical properties. Reason: de-Broglie’s wavelength is directly related Reason: Isotopes have same electronic to mass of subatomic particles. configuration. (1) Both assertion and reason are correct, and the (1) Both assertion and reason are correct, and the reason is the correct explanation for the reason is the correct explanation for the assertion. assertion. (2) Both assertion and reason are correct, and the (2) Both assertion and reason are correct, and the reason is not the correct explanation for the reason is not the correct explanation for the assertion. assertion. (3) The assertion is true, but the reason is false. (3) The assertion is true, but the reason is false. (4) The assertion is false, but the reason is true. (4) The assertion is false, but the reason is true. 49. Assertion: Angular momentum of an electron in an atom is quantized. Reason: In an atom only those orbits are permitted in which angular momentum of the electron is a natural number multiple of h/2π. (1) Both assertion and reason are correct, and the reason is the correct explanation for the assertion. (2) Both assertion and reason are correct, and the reason is not the correct explanation for the assertion. (3) The assertion is true, but the reason is false. (4) The assertion is false, but the reason is true.  7 Answer key will be provided tomorrow 1. (1) 11. (3) 21. (3) 31. (1) 41. (1) 2. (4) 12. (2) 22. (2) 32. (2) 42. (4) 3. (2) 13. (4) 23. (4) 33. (3) 43. (2) 4. (2) 14. (4) 24. (1) 34. (2) 44. (1) 5. (2) 15. (3) 25. (4) 35. (2) 45. (1) 6. (2) 16. (4) 26. (3) 36. (2) 46. (3) 7. (4) 17. (3) 27. (2) 37. (3) 47. (2) 8. (1) 18. (1) 28. (1) 38. (2) 48. (3) 9. (4) 19. (1) 29. (2) 39. (2) 49. (1) 10. (1) 20. (2) 30. (3) 40. (1) 50. (1) PW Web/App - https://smart.link/7wwosivoicgd4 Library- https://smart.link/sdfez8ejd80if