Classification of Elements and Periodicity in properties – 7

1) A small subatomic particle was passed through large water tanks containing Cd. The existence of this particle was inferred when two were produced and a neutron was captured by Cd. The particle was a/an
a) Proton
b) Anti-neutrino
c) Electron
d) Neutron

2) If an equal number of atoms of two radioactive elements are considered, the most dangerous
would be the one with a half life of

a) 4.0 million years
b) 100 years
c) 0.01 sec
d) 1 sec

3) By measuring the radiation emitted by radioactive substances added to blood, the volume of the latter can be obtained. The blood volume is measured by using the radioactive isotope
a) I-131
b) H-3
c) C-13
d) U-238

4) In a reaction , the particle Z is a
b) Deutron
c) Neutron
d) Proton

5) The atomic mass and atomic number of lead are 208 and 82 respectively.The atomic mass and atomic number of bismuth are 209 and 83 respectively. The Neutron/Proton ratios in one atom of the two elements
a) Is higher in lead than in bismuth
b) Is lower in lead than in bismuth
c) Is equal in both lead and bismuth
d) None

6) When the N/P ratio of an isotope is greater than the stable isotope of that element, it emits a
c) Neutron
d) Positron

7) Which of the following does not contain material particles?
c) Anode rays
d) Gamma rays

8) The common moderator of a nuclear reactor is
b) Graphite
c) Beryllium
d) All are correct

9) Which of the following is an artificial radioactive series?
a) 4n+l
b) 4n+2
c) 4n
d) 4n+3

10) The missing particle in the reaction is :

11) Radioactivity is due to
a) a stable electronic configuration
b) a stable nucleus
c) an unstable nucleus
d) an unstable electronic configuration

12) After three half lives, the percentage of the original amount left is
a) 6.35
b) 12.5
c) 50
d) 75

13) A light nuclide that has n/p ratio 2 and has the magic number of neutrons but still shows radioactivity is ….

14) is neutron poor. Its stability can be increased by
a) Positron emission
b) Beta – decay
c) Alpha – decay
d) Electron capture

15) In breeder reactors
a) Th – 232 isotope can be used to breed the fissionable isotope, U – 233
b) The U – 238 isotope can be used to breed the fissionable isotope Pu – 239
c) More fissionable material is produced than it is consumed
d) All of these are true

16) A radioactive isotope decays at a rate such that after 96-min only l/8th of the original amount remains. The of this nuclide is?
a) 12 min
b) 32 min
c) 24 min
d) 48 min

17) Which one of the following isotopes would be most likely to undergo fission?

18) In a breeder reactor which of the following is converted to fissionable fuel?

19) Which of the following statements is wrong?
d) The excessive use of radioactive elements is responsible for cancerous growth

20) X and Y are isotones. Their mass numbers are70 and 72 respectively. If the atomic number of X is 34, what is that of Y?
a) 32
b) 36
c) 30
d) 38

21) The radioactive isotopes which have an excessive neutron/proton ratio generally exhibit
a) Positron emission
b) X ray emission
c) Alpha emission
d) Beta emission

22) In a nuclear chain reaction
a) All the neutrons produced by the initial fission event are captured
b) Each fission event produces ten or more neutrons
c) Each fission event produces one to three neutrons
d) Each fission fragment fissions into two smaller fragments

23) A high value for the half-life period of a radioactive element means
a) High instability
b) Greater stability

24) What is the half-life of , if its disintegration constant is 2.31 10-4 year-1?

25) The half-life period of a substance is 77 days. Calculate the decay constant.

26) @ For Fe the mass defect is 0.528068u. Calculate the binding energy per nucleon. (Iu=931Mev)
a) 87.8 MeV
b) 8.78 MeV
c) 878 MeV
d) 492 MeV

27) In the following nuclear reactions and . The and X2 are respectively

28) 24195Am and 23490Th belong respectively to the
a) 4n and 4n+l radioactive series
b) 4n+l and 4n+3 radioactive series
c) 4n+l and 4n+2 radioactive series
d) 4n+l and 4n radioactive series

29) In the sequence of the following nuclear reactions, , the value of n will be
a) 3
b) 4
c) 5
d) 6

30) The radium and uranium atoms in a sample of uranium mineral are in the ratio of 1: 2.8 x 106. If the half-life period of radium is 1620 years, the half-life period of uranium will be

31) The activity of carbon-14 in a piece of an ancient wood is only 12.5%. If the half-life period of C-14 is 5760 years, the age of the piece of wood is

32) The end product of the (4n+1) radioactive disintegration series is

33) Gallium was named by Mendeleev as
a) Eka – aluminium
b) Eka – silicon
c) Eka – germanium
d) Eka – Zinc

34) The element with atomic number 59 belongs to the
a) Lanthanides
b) Actinides
c) Transition elements
d) S- block

35) The number of elements present in the fifth period of the periodic table is
a) 8
b) 15
c) 18
d) 32

36) Mosley proposed that the properties of elements are dependent upon their
a) Atomic number
b) Atomic weight
c) Positron number
d) Deutron number

37) The group number of an element with atomic number 57 is
a) 3
b) 4
c) 5
d) 6

38) Transuranic elements
a) Are all synthetic elements
b) Include element no. 104
c) Have fixed valency
d) None of the above

39) The 3 d transition series contains elements having atomic number from
a) 22 to 30
b) 21 to 30
c) 21 to 31
d) 21 to 29

40) The element with the atomic number 24 in the periodic table belongs to group
a) 4
b) 5
c) 6
d) 7

41) Atomic radii decrease on moving
a) From left to right in any given period
b) From top to bottom in any given group
c) Diagonally in the periodic tables
d) None of the above

42) In a period from Li to F, the ionisation potential
a) Increases
b) Decreases
c) Remains constant
d) None of these

43) The ionization potential of an element does not depend upon
a) Its nuclear charge
b) The shielding effect
c) its electron neutrality
d) its penetrating effect

44) The most electronegative element of the following is
a) F
b) Na
c) O
d) S

45) The correct order of decreasing electro negativity is
a) I > Br > Cl > F
b) F > Cl > Br > I
c) Cl > F > Br > I
d) Br > Cl > I > F

46) In the long form of the periodic table all the non-metals are placed in the
a) s – block
b) p – block
c) f – block
d) d – block

47) The fifth period of elements in the periodic table correspond to the filling up of
a) 5s
b) 4d
c) 5p
d) all these

48) An element ‘X’ has an atomic number 53. The atomic numbers of the elements placed just above and below it in the periodic table will be
a) 21 and 61
b) 45 and 85
c) 35 and 85
d) 35 and 61

49) d-block elements have their inner electronic configuration as
a) ns1
b) ns2
c) both (a) and (b)
d) (n-1)d1-10

50) Which of the following triads of elements is not truly transitional?
a) Fe,Co,Ni
b) Fe,Ru,Os
c) Ni,Pd,Pt
d) Zn,Cd,Hg

51) The number of transition series of elements in the periodic table is
a) 2
b) 3
c) 4
d) 5

52) The effective nuclear charge experienced by the valence shell electron of Fluorine is
a) 9
b) 3.8
c) 7.6
d) 5.2

53) The increasing order of ionic radii for the ions O2-, Na+, Mg2+, AI3+ is
a) Na+ > Mg2+ > AI3+> O 2-
b) O 2- > AI 3+ > Mg 2+ > Na +
c) AI 3+ < Mg 2+ > Na + < O 2-
d) AI 3+ < Mg 2+ < Na + < O 2-

54) The number of electrons present per mole of nitride ion and azide ion respectively are
a) 6N,21 N
b) 7N,22N
c) 8N,24N
d) 10N,22N

55) The first and second ionization potential values of two elements X and Y are

Element        First I.P.     Second I.P.kJ/.mol
     X                520                7298
     Y                495.8              4562 
X and Y are
a) alkali metals
b) alkaline earth metals
c) transition metals
d) inner transition elements

56) The increasing order of first ionization potential values for Be, B, N and O is 
a) Be<b<n<o
b) B<be<o<n
c) B>Bi>N>O
d) O<n<be<b

57) To which period and group in the periodic table does the element unil quadium (104 Unq) belong according to the IUPAC system ?
a) 7,0
b) 7,1
c) 7,2
d) 7,4

58) The elements with the highest electronegativity and electron affinity are 
a) F,F
b) Cl,Cl
c) Cl,F
d) F,Cl

59) The electro negativity values of the elements O,F,N and Cl are in the order 
a) F>C1>O>N
b) F>O>N=Cl
c) F>O>N>Cl
d) F < O > N > Cl

60) The pair of compounds among the following which will dissolve in water is
a) NaHCO3 and Mg(HCO3)2
b) Na2CO3,MgCO3
c) Na2CO3, Mg(HCO3)2
d) NaHCO3 Mg2CO3

61) The electronic configuration of the Re3+ ion is [Xe]4f145 d4. The atomic number of the element is 
a) 72
b) 73
c) 74
d) 75

62) The charge on the K+ ion, potassium metal and potassium nucleus respectively is
a) +1,0,+19
b) +1,0,+1
c) 0,0,+1
d) +18,0,+1




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