ECAT Chemistry Chapter 5 Atomic Structure Online Test With Answers

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ECAT Chemistry Chapter 5 Atomic Structure Online Test

Sr. # Questions Answers Choice
1 Which of the following orbitals have a dumb bell shape? s p d f
2 The total number of orbitals in a shell with principal quantum number 'n' is 2n 2n<sup>2</sup> n<sup>2</sup> n + 1
3 Rutherford's experiment led to the discovery of Nucleus Electron Proton alpha particle
4 Azimuthal quantum number of last electron of 11Na is 1 2 3 0
5 For which of the following sets of quantum numbers and electron will have the highest energy? 3,2,1,1/2 4,2,-1,1/2 4,1,0,-1/2 5,0,0,1/2
6 The radius of second Bohr's orbit is 0.053 nm 0.053/4 nm 0.053 x 4 nm 0.053 x 20 nm
7 The electron in an atom moves randomly around the nucleus has fixed space around the nucleus is stationary in various energy levels moves around its nucleus in definite energy levels
8 If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be 1 4 9 12
9 The total number of possible values of magnetic quantum number for the value of l=3 is 3 1 5 7
10 The electronic configuration of an atom/ion can be defined by the following Aufbau principle Pauli's exclusion principle Hund's Rule All the above
11 Number of neutrons in heavy hydrogen atom is 0 1 2 3
12 The number of spherical nodes in 3p orbitals are One Three Non Two
13 The spectrum of helium is expected to be similar to that of H Li<sup>+</sup> Na He<sup>+</sup>
14 Subsidiary quantum number specifies size of orbital shape of orbital orientations of orbitals Nuclear stability
15 Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the low ionization energy of sodium sublimation of metallic sodium to give yellow vapour emission of excess energy absorbed as a radiation in the visible region as a radiation in the visible region photosenitivity
16 The number of neutrons in the element 94Be is 4 5 9 13
17 The valence orbital configuration of an element with atomic number 23 is 3d<sup>5</sup> 3d<sup>3</sup>, 4s<sup>2</sup> 3d<sup>3</sup>, 4s<sup>1</sup>, 4p<sup>1</sup> 3d<sup>2</sup>,4s<sup>2</sup>,4p<sup>1</sup>
18 Which quantum number is sufficient to describe the electron is hydrogen atom? l n m s
19 When electrons revolve in stationary orbits There is no change in energy level They vecome stationary They are gaining kinetic energy There is increase in energy
20 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is N Li P Na
21 The number of electrons in the M shell of the element with atomic number 24 is 24 12 13 8
22 The maximum number of electrons in a subshell for which l = 3 is 14 10 8 4
23 The ratio of the ionization energy of H and Be3+is 1 : 1 1 : 3 1 : 9 1 : 16
24 The mass of the neutron is of the order of 10<sup>-23 </sup>kg 10<sup>-24</sup>kg 10<sup>-26</sup>kg 10<sup>-27</sup>kg
25 The credit of discovering neutron goes to Rutherford Langmuir Chadwick Austen
26 With increasing principle quantum number, the energy difference between adjacent energy levels in H atom Decreases Increases Remains constant Decreases for low value of Z and increase for higher value of Z
27 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as Balmer series Lyman series Pfund series Brackett series
28 When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as Paschen Pfund Balmer Brackett
29 Photons of yellow colour are ______ energetic than violet colour More Less Equal None
30 The quantum number which describe the orientation of the orbitals is Spin quantum number Principle quantum number Azimathal quantum number Magnetic quantum number
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