CHEMISTRY ASSIGNMENT :: ATOMIC STRUCTURE

Multiple Choice Questions with ONE correct answer1. Rutherfords experiment on scattering of a-particles showed for the first time that the atomhas(a) electrons (b) proton (c) nucleus (d) neutrons2. Any p-orbital can accommodate upto(a) four electrons (b) six electron(c) two electrons with parallel spins (d) two electrons with opposite spins3. The principal quantum number of an atom is related to the(a) size of the orbital (b) spin angular momentum(c) orbital angular momentum (d) orientation of the orbital in space4. Rutherfords scattering experiment is related to the size of the(a) nucleus (b) atom (c) electron (d) neutron5. The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton(p), neutron (n) and alpha particle (a) is:(a) e, p ,n, a (b) n, p, e, a (c) n, p, a, e (d) n, a, p, e6. Correct set of four quantum numbers for the valence (outermost) electron of rubidium(Z = 37) is:(a) 5, 0, 0, +1/2 (b) 5, 1, 0, +1/2 (c) 5, 1, 1, +1/2 (d) 6, 0, 0, +1/27. Which electronic level would allow the hydrogen atom to absorb a photon but not to emit aphoton?(a) 3s (b) 2p (c) 2s (d) 1s8. Bohr model can explain:(a) the spectrum of hydrogen atom only(b) spectrum of an atom or ion containing one electron only(c) the spectrum of hydrogen molecule (d) the solar spectrum9. The radius of an atomic nucleus is of the order of:(a) 1010 cm (b) 1013 (c) 1015 cm (d) 108 cm10. Electromagnetic radiation with maximum wavelength is(a) ultraviolet (b) radio wave (c) X-ray (d) infrared11. Rutherfords alpha particle scattering experiment eventually led to the conclusion that:(a) mass and energy are related (b) electrons occupy space around the nucleus(c) neutrons are buried deep in the nucleus.(d) the point of impact with matter can be precisely determined.12. Which one of the following sets of quantum numbers represents an impossible arrangement?n I mI ms(A) 3 2 2 1/2(B) 4 0 0 1/2(C) 3 2 3 1/2(D) 5 3 0 1/213. The ratio of the energy of a photon of 2000A0 wavelength radiation to that of 4000A0radiation is:(a) 1/4 (b) 4 (c) 1/2 (d) 214. The triad of nuclei that is isotonic is(A) 14 15 176 7 9 C, N, F (B) 12 14 196 7 9 C, N, F (C) 14 14 176 7 9 C, N, F (D) 14 14 196 7 9 C, N, F15. The wavelength of a spectral line for an electronic transition is inversely related to:(a) The number of electrons undergoing the transition(b) The nuclear charge of the atom(c) The difference in the energy of the energy levels involved in the transition(d) The velocity of the electron undergoing the transition.16. The orbital diagram in which the Aufbau.principle is violated is:(A) 2s 2p(B) 2s 2p(C) 2s 2p(D) 2s 2p17. The outermost electronic configuration of the most electronegative element is(a) ns2np3 (b) ns2np4 (c) ns2np5 (d) ns2np618. The correct ground state electronic configuration of chromium atom is:(a) [Ar] 4d54s1 (b) [Ar] 3d44s2 (c) [Ar] 3d64s0 (d) [Ar] 4d55s119. The correct set of quantum numbers for the unpaired electron of chlorine atom is:n l m(A) 2 1 0(B) 2 1 1(C) 3 1 1(D) 3 0 020. Which of the following does not characterize X-rays?(a) The radiation can ionize gases (b) It causes ZnS to fluoresce(c) Deflected by electric and magnetic fields(d) Have wavelengths shorter than ultraviolet rays21. Which of the following relates to photons both as wave motion and as a stream of particles?(a) Inference (b) E = mc2 (c) Diffraction (d) E = hn22. A 3p orbital has(a) two non spherical nodes (b) two spherical nodes(c) one spherical one non spherical node (d) one spherical and two non spherical nodes23. The orbital angular momentum of an electron in 2s orbital is:(a)1 h.2 2+p(b) Zero (c)h2p(d)h2.2p24. The first use of quantum theory to explain the structure of atom was made by(a) Heisenberg (b) Bohr (c) Planck (d) Einstein25. For a d-electron, the orbital angular momentum is(a) 6 (h / 2p) (b) 2 (h / 2p) (c) (h/2p) (d) 2(h/2p)26. Assertion: Nuclide 3013 Al is less stable than 4020CaReason: Nuclides having odd number of protons and neutrons are generally unstable.(a) If both assertion and reason are correct, and reason is the correct explanation of theassertion.(b) If both assertion and reason are correct, but reason is not the correct explanation of theassertion.(c) If assertion is correct but reason is incorrect.(d) If assertion is incorrect but reason is correct.27. The electrons, identified by quantum numbers n and I, (i) n = 4, l = 1, (ii) n = 4, I = 0,(iii) n = 3, l = 2, and (iv) n = 3, I = 1 can be placed in order of increasing energy, from thelowest to highest, asa) iv 28. The number of nodal planes in a px orbital is(a) one (b) two (c) three (d) zero29. The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d5 4s1. This represents its(a) excited state (b) ground state (c) cationic form (d) anionic form30. The wavelength associated with a golf ball weighing 200 g and moving at a speed of 5 m/h isof the order(a) 1010 m (b) 1020 m (c) 1030 m (d) 1040 m31. The quantum numbers +1/2 and 1/2 for the electron spin represent(a) rotation of the electron in clockwise and anticlockwise direction respectively(b) rotation of the electron in anticlockwise and clockwise direction respectively(c) magnetic moment of the electron pointing up and down respectively(d) two quantum mechanical spin states which have no classical analogue32. Rutherfords experiment, which established the nuclear model of the atom, used a beam of (a)b -particles, which impinged on a metal foil and got absorbed(b) g -rays, which impinged on a metal foil and ejected electrons(c) helium atoms, which impinged on a metal foil and got scattered(d) helium nuclei, which impinged on a metal foil and got scattered33. If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that ofthe normal ground state configuration 2 2 3 1s 2s 2p because the electrons would be closer to thenucleus. Yet 1s7 it is not observed because it violates.(a) Heisenberg uncertainty principle (b) Hunds rule(c) Pauli exclusion, principle (d) Bohr postulate of stationary orbits34. The radius of which of the following orbit is same as that of the first Bohrs orbit of hydrogenatom?(a) He+ (n = 2) (b) Li2+ (n = 2) (c) Li2+ (n = 3) (d) Be3+ (n = 2)35. The number of radial nodes of 3s and 2p orbitals are respectively(a) 2, 0 (b) 0, 2 (c) 1, 2 (d) 2, 1

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CHEMISTRY ASSIGNMENT :: ATOMIC STRUCTURE

Multiple Choice Questions with ONE correct answer1. Rutherfords experiment on scattering of a-particles showed for the first time that the atomhas(a) electrons (b) proton (c) nucleus (d) neutrons2. Any p-orbital can accommodate upto(a) four electrons (b) six electron(c) two electrons with parallel spins (d) two electrons with opposite spins3. The principal quantum number of an atom is related to the(a) size of the orbital (b) spin angular momentum(c) orbital angular momentum (d) orientation of the orbital in space4. Rutherfords scattering experiment is related to the size of the(a) nucleus (b) atom (c) electron (d) neutron5. The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton(p), neutron (n) and alpha particle (a) is:(a) e, p ,n, a (b) n, p, e, a (c) n, p, a, e (d) n, a, p, e6. Correct set of four quantum numbers for the valence (outermost) electron of rubidium(Z = 37) is:(a) 5, 0, 0, +1/2 (b) 5, 1, 0, +1/2 (c) 5, 1, 1, +1/2 (d) 6, 0, 0, +1/27. Which electronic level would allow the hydrogen atom to absorb a photon but not to emit aphoton?(a) 3s (b) 2p (c) 2s (d) 1s8. Bohr model can explain:(a) the spectrum of hydrogen atom only(b) spectrum of an atom or ion containing one electron only(c) the spectrum of hydrogen molecule (d) the solar spectrum9. The radius of an atomic nucleus is of the order of:(a) 1010 cm (b) 1013 (c) 1015 cm (d) 108 cm10. Electromagnetic radiation with maximum wavelength is(a) ultraviolet (b) radio wave (c) X-ray (d) infrared11. Rutherfords alpha particle scattering experiment eventually led to the conclusion that:(a) mass and energy are related (b) electrons occupy space around the nucleus(c) neutrons are buried deep in the nucleus.(d) the point of impact with matter can be precisely determined.12. Which one of the following sets of quantum numbers represents an impossible arrangement?n I mI ms(A) 3 2 2 1/2(B) 4 0 0 1/2(C) 3 2 3 1/2(D) 5 3 0 1/213. The ratio of the energy of a photon of 2000A0 wavelength radiation to that of 4000A0radiation is:(a) 1/4 (b) 4 (c) 1/2 (d) 214. The triad of nuclei that is isotonic is(A) 14 15 176 7 9 C, N, F (B) 12 14 196 7 9 C, N, F (C) 14 14 176 7 9 C, N, F (D) 14 14 196 7 9 C, N, F15. The wavelength of a spectral line for an electronic transition is inversely related to:(a) The number of electrons undergoing the transition(b) The nuclear charge of the atom(c) The difference in the energy of the energy levels involved in the transition(d) The velocity of the electron undergoing the transition.16. The orbital diagram in which the Aufbau.principle is violated is:(A) 2s 2p(B) 2s 2p(C) 2s 2p(D) 2s 2p17. The outermost electronic configuration of the most electronegative element is(a) ns2np3 (b) ns2np4 (c) ns2np5 (d) ns2np618. The correct ground state electronic configuration of chromium atom is:(a) [Ar] 4d54s1 (b) [Ar] 3d44s2 (c) [Ar] 3d64s0 (d) [Ar] 4d55s119. The correct set of quantum numbers for the unpaired electron of chlorine atom is:n l m(A) 2 1 0(B) 2 1 1(C) 3 1 1(D) 3 0 020. Which of the following does not characterize X-rays?(a) The radiation can ionize gases (b) It causes ZnS to fluoresce(c) Deflected by electric and magnetic fields(d) Have wavelengths shorter than ultraviolet rays21. Which of the following relates to photons both as wave motion and as a stream of particles?(a) Inference (b) E = mc2 (c) Diffraction (d) E = hn22. A 3p orbital has(a) two non spherical nodes (b) two spherical nodes(c) one spherical one non spherical node (d) one spherical and two non spherical nodes23. The orbital angular momentum of an electron in 2s orbital is:(a)1 h.2 2+p(b) Zero (c)h2p(d)h2.2p24. The first use of quantum theory to explain the structure of atom was made by(a) Heisenberg (b) Bohr (c) Planck (d) Einstein25. For a d-electron, the orbital angular momentum is(a) 6 (h / 2p) (b) 2 (h / 2p) (c) (h/2p) (d) 2(h/2p)26. Assertion: Nuclide 3013 Al is less stable than 4020CaReason: Nuclides having odd number of protons and neutrons are generally unstable.(a) If both assertion and reason are correct, and reason is the correct explanation of theassertion.(b) If both assertion and reason are correct, but reason is not the correct explanation of theassertion.(c) If assertion is correct but reason is incorrect.(d) If assertion is incorrect but reason is correct.27. The electrons, identified by quantum numbers n and I, (i) n = 4, l = 1, (ii) n = 4, I = 0,(iii) n = 3, l = 2, and (iv) n = 3, I = 1 can be placed in order of increasing energy, from thelowest to highest, asa) iv 28. The number of nodal planes in a px orbital is(a) one (b) two (c) three (d) zero29. The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d5 4s1. This represents its(a) excited state (b) ground state (c) cationic form (d) anionic form30. The wavelength associated with a golf ball weighing 200 g and moving at a speed of 5 m/h isof the order(a) 1010 m (b) 1020 m (c) 1030 m (d) 1040 m31. The quantum numbers +1/2 and 1/2 for the electron spin represent(a) rotation of the electron in clockwise and anticlockwise direction respectively(b) rotation of the electron in anticlockwise and clockwise direction respectively(c) magnetic moment of the electron pointing up and down respectively(d) two quantum mechanical spin states which have no classical analogue32. Rutherfords experiment, which established the nuclear model of the atom, used a beam of (a)b -particles, which impinged on a metal foil and got absorbed(b) g -rays, which impinged on a metal foil and ejected electrons(c) helium atoms, which impinged on a metal foil and got scattered(d) helium nuclei, which impinged on a metal foil and got scattered33. If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that ofthe normal ground state configuration 2 2 3 1s 2s 2p because the electrons would be closer to thenucleus. Yet 1s7 it is not observed because it violates.(a) Heisenberg uncertainty principle (b) Hunds rule(c) Pauli exclusion, principle (d) Bohr postulate of stationary orbits34. The radius of which of the following orbit is same as that of the first Bohrs orbit of hydrogenatom?(a) He+ (n = 2) (b) Li2+ (n = 2) (c) Li2+ (n = 3) (d) Be3+ (n = 2)35. The number of radial nodes of 3s and 2p orbitals are respectively(a) 2, 0 (b) 0, 2 (c) 1, 2 (d) 2, 1

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