Atomic Structure (CSM) (27!08!09)
3
Quiz FIITJEE CHENNAI CENTRE Subject: Chemistry Topic: Atomic Structure NAME: 1. The radius of which of the following orbit is same as that of first Bohr’s orbit of hydrogen (a) He + (n = 2) (b) Li 2+ (n = 2) (c) Li 2+ (n = 3) (d) Be 3+ (n = 2) 2. The wavelength associated with a gold ball weighing 200g and moving at a speed of 5 m/h is of the order (a) 10 –10 m (b) 10 –20 m (c) 10 –30 m (d) 10 –40 m 3. The electronic configuration of an element is 1s 2 2s 2 2p 6 3s 2 3p 5 4s 1 . This represents its (a) excited state (b) ground state (c) cationic form (d) anionic form 4. The number of nodal planes in a P x orbital is (a) 1 (b) 2 (c) 3 (d) 0 5. The e – s identified by quantum numbers n, and l (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to the higher, as (a) iv < ii < iii < i (b) ii < iv < i < iii (c) i < iii < ii < iv (d) iii < i < iv < ii 6. The orbital angular momentum of 3d electron is (a) (b) (c) (d) 7. Which of the following relates to photons both as wave motion and as a stream of particles? (a) Diffraction (b) E = mc 2 (c) Interference (d) E = hν 8. The energy of an e – in the first Bohr’s orbit of H atom is –13.6 ev. The possible energy value(s) of the excited state(s) for electrons in Bohr orbit of hydrogen is (a) –3.4 ev (b) –4.2 ev (c) –6.8 ev (d) +6.8 ev 9. The increasing order (lowest first) for the values of e/m for electron (e), proton (p), neutron (n) and alpha particle (a) is (a) e, p, n, α (b) n, p, e, α (c) n, p, α, e (d) n, α, p, e 10. Which of the level would allow the H atom to absorb a photon but not to emit a photon? FIITJEE CHENNAI CENTRE. New No: 11, 29 th Cross Street, Indira Nagar, Adyar, Chennai-20. Ph.64609556.E-ail:adyar@fiitjee.com.
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Transcript of Atomic Structure (CSM) (27!08!09)
CHAPTER PRACTICE PROBLEM
Quiz
FIITJEE CHENNAI CENTRE
Subject: Chemistry
Topic: Atomic Structure
NAME:
Quiz
1. The radius of which of the following orbit is same as that of first Bohrs orbit of hydrogen
(a) He+ (n = 2)(b) Li2+ (n = 2)(c) Li2+ (n = 3)(d) Be3+ (n = 2)
2. The wavelength associated with a gold ball weighing 200g and moving at a speed of 5 m/h is ofthe order
(a) 1010m(b) 1020m(c) 1030m(d) 1040m
3. The electronic configuration of an element is 1s2 2s2 2p6 3s2 3p5 4s1. This represents its
(a) excited state(b) ground state(c) cationic form(d) anionic form
4. The number of nodal planes in a Px orbital is
(a) 1(b) 2(c) 3(d) 0
5. The es identified by quantum numbers n, and l (i) n = 4, l = 1 (ii) n = 4, l = 0 (iii) n = 3, l = 2 and (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to the higher, as
(a) iv < ii < iii < i(b) ii < iv < i < iii(c) i < iii < ii < iv(d) iii < i < iv < ii
6. The orbital angular momentum of 3d electron is
(a)
(b)
(c)
(d)
7. Which of the following relates to photons both as wave motion and as a stream of particles?
(a) Diffraction(b) E = mc2(c) Interference(d) E = h8. The energy of an e in the first Bohrs orbit of H atom is 13.6 ev. The possible energy value(s) of the excited state(s) for electrons in Bohr orbit of hydrogen is
(a) 3.4 ev(b) 4.2 ev(c) 6.8 ev(d) +6.8 ev
9. The increasing order (lowest first) for the values of e/m for electron (e), proton (p), neutron (n) and alpha particle (a) is
(a) e, p, n, (b) n, p, e, (c) n, p, , e(d) n, , p, e
10. Which of the level would allow the H atom to absorb a photon but not to emit a photon?
(a) 3s(b) 2p(c) 1s(d) 2s
11. The correct set of four quantum numbers of outermost e of Rb (Z = 37) is
(a) 5, 0, 0, + (b) 5, 10, + (c) 5, 1, 1, + (d) 6, 0, 0, +
12. The ratio of the energy of a photon of 2000 A( wavelength radiation to that of 4000 A(radiation is
(a) (b) 4(c) (d) 2
13. Which have the same number of es as the d electrons in Fe2+
(a) Li(b) Na(c) N(d) C
14. The highest excited state that H can reach when they are bombarded with 12.08 ev is
(a) n = 1(b) n = 2(c) n = 3(d) n = 4
15. If total energy of an e in a H atom in excited state is 3.4 ev, then the de-Broglie wavelength of the electron is
(a) 6.6 ( 1010 m(b) 3 ( 1010 m(c) 5 ( 109 m(d) 9.3 ( 1012 m
CHEMISTRY
Atomic StructureANSWER KEY
1. D2. C3. 4. A
5. A6. A7. D8. A
9. D10. C11. A12. D
13. D14. C15. A
FIITJEE CHENNAI CENTRE. New No: 11, 29th Cross Street, Indira Nagar, Adyar, Chennai-20. Ph.64609556.E-ail:[email protected].
FIITJEE CHENNAI CENTRE. New No: 11, 29th Cross Street, Indira Nagar, Adyar, Chennai-20. Ph.64609556.E-ail:[email protected].
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