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Class 9 Science
Structure Of The Atom
Quiz 3
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When a \(\beta\)-particle is emitted, the atomic number of the daughter elements is one unit more as compared to that of the parent element. This increase in atomic number is due to:
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Addition of a proton to the nucleus
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Removal of an electron from the nucleus
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The decay of neutron present in the nucleus
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Any one of the above
Which of the following describes an isotope with a mass number of 99 that contains 56 neutrons in its nucleus?
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99Ba56
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56Tc43
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99Tc43
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43Ba56
By whom was neutron discovered?
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Rutherford
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Chadwick
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Dalton
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Bohr
Members of which of the following have similar chemical properties?
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Isobars
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Allotropes
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Isotope
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Both isotopes and allotropes
17Cl35 and 17Cl37 are examples of:
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Isobars
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Isotopes
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Isoelectronic atoms
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None of the above
Which one of the following statement is not true?
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The total number of neutrons and protons is always equal in a neutral atom
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Most of the space in an atom is empty
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The total number of electrons and protons in an atom is always equal
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The total number f electrons in any energy level can be calculated by the formula 2n2
5525Mn++ has:
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25 protons and 30 neutrons
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25 neutrons and 25 protons
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25 electrons and 40 protons
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None of the above
Which of the following electronic configurations is wrong?
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Be (3) = 2, 1
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S (16) = 2, 6, 8
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P (15) = 2, 8, 5
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S (16) = 2, 6, 8
The fluorescence on the walls of discharge tube is due to:
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Cathode rays
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Anode rays
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Canal rays
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None of the above
The correct representation of 3 molecules of chlorine is:
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2Cl3
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3 Cl2
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6 CI
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Cl6
13Al27 is a stable isotope. 13Al29 is expected to disintegrate by:
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α emission
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β emission
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Positron emission
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Proton emission
The four quantum numbers that could identify the third 3p electron in sulphur are:
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N = 3, 1 = 1, m = -1, s = +1/2
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N = 2, 1 = 2, m = -1, s = -1/2
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N = 3, 1 = 0, m = +1, s = +1/2
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N = 3, 1 = 2, m = +1, s = -1/2
n/p ratio of an element with atomic number greater tha 83 falls in the zone of instability. The element will undergo:
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β+ -decay
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No decay
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β -decay
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α - decay
Which of the following orbital is more close to the nucleus?
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5f
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6d
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7p
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7s
Aluminum has a valence of 3 and sulphate has a valence ofTherefore, the correct formula for aluminum sulphate is:
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AlSO4
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Al3 (SO4)2
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Al2 (SO4)3
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Al2S2O4
Which of the following nuclides is least likely to be stable?
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25Mn55
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13AL30
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50Sn119
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20C40
The shortest wavelengths of radiation emitted when can electron from infinity falls into the ionized H-atom(RH = 1.097 x 107 m-1)
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91 nm
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192 nm
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406 nm
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1.9 x 10-8 nm
The atomic number of the element with maximum number of unpaired electrons is:
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26
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33
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23
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15
The orbital angular momentum of 2p electron is:
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zero
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3h
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6h
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(2h)/(2n)
Proton bombardment of Th230 followed by emission of two alpha particles produces:
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Ra223
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Rn232
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Fr222
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Fr223
0 h : 0 m : 1 s
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