JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank

done Causes of radioactivity and Group displacement law Total Questions - 75

• question_answer1)
  \[_{95}A{{m}^{241}}\] and \[_{90}T{{h}^{234}}\] belong respectively to [MP PMT 1999]
  A)
                  \[4n\] and \[4n+1\] radioactive disintegration series done clear
  B)
                  \[4n+1\] and \[4n+2\] radioactive disintegration series done clear
  C)
                  \[4n+1\] and \[4n+3\] radioactive disintegration series done clear
  D)
                  \[4n+1\] and \[4n\] radioactive disintegration series done clear
  View Solution play_arrow

• question_answer2)
  Group displacement law states that the emission of \[\alpha \] or \[\beta \] particles results in the daughter element occupying a position, in the periodic table, either to the left or right of that of the parent element. Which one of the following alternatives gives the correct position of the daughter element
  A)
   On emission of \[\alpha \] particles -2 groups to the right           On emission of \[\beta \] particles-1 group to the right done clear
  B)
   On emission of \[\alpha \] particles -2 groups to the right           On emission of \[\beta \] particles-1 group to the left done clear
  C)
   On emission of \[\alpha \] particles -    2 groups to the left         On emission of \[\beta \] particles-1 group to the left done clear
  D)
   On emission of \[\alpha \] particles -2 groups to the left             On emission of \[\beta \] particles-1 group to the right done clear
  View Solution play_arrow

• question_answer3)
  The nuclides (A nuclide is the general name for any nuclear species) \[_{6}{{C}^{12}}{{,}_{26}}F{{e}^{56}}\] and \[_{92}{{U}^{238}}\] have 12, 56 and 238 nucleons respectively in the nuclei. The total number of nucleons in a nucleus is equal to               [NCERT 1975]
  A)
                  The total number of neutrons in the nucleus done clear
  B)
                  The total number of neutrons in the atom done clear
  C)
                  The total number of protons in the nucleus done clear
  D)
                  The total number of protons and neutrons in the nucleus done clear
  View Solution play_arrow

• question_answer4)
  Radioactivity is due to    [DPMT 1983, 89; AIIMS 1988]
  A)
                  Stable electronic configuration done clear
  B)
                  Unstable electronic configuration done clear
  C)
                  Stable nucleus done clear
  D)
                  Unstable nucleus done clear
  View Solution play_arrow

• question_answer5)
  Radioactive disintegration differs from a chemical change in being            [MNR 1991]
  A)
                  An exothermic change done clear
  B)
                  A spontaneous process done clear
  C)
                  A nuclear process done clear
  D)
                  A unimolecular first order reaction done clear
  View Solution play_arrow

• question_answer6)
  \[_{92}^{238}U\] emits 8 a-particles and 6 b-particles. The neutron/proton ratio in the product nucleus is  [AIIMS 2005]
  A)
                  60/41     done clear
  B)
                  61/40 done clear
  C)
                  62/41     done clear
  D)
                  61/42 done clear
  View Solution play_arrow

• question_answer7)
  The element with atomic number 84 and mass number 218 change to other element with atomic number 84 and mass number 214. The number of \[\alpha \] and \[\beta \]-particles emitted are respectively              [CPMT 1989]
  A)
                  1, 3         done clear
  B)
                  1, 4 done clear
  C)
                  1, 2         done clear
  D)
                  1, 5 done clear
  View Solution play_arrow

• question_answer8)
  A  radium \[_{88}R{{a}^{224}}\] isotope, on emission of an \[\alpha \]-particle gives rise to a new element whose mass number and atomic number will be [CPMT 1980; EAMCET 1985; MP PMT 1993]
  A)
                  220 and 86           done clear
  B)
                  225 and 87 done clear
  C)
                  228 and 88           done clear
  D)
                  224 and 86 done clear
  View Solution play_arrow

• question_answer9)
  \[_{89}A{{c}^{231}}\] gives \[_{82}P{{b}^{207}}\] after emission of some \[\alpha \]and \[\beta \]-particles. The number of such \[\alpha \] and \[\beta \]-particles are respectively               [MP PMT 1993; UPSEAT 2001]
  A)
                  5, 6         done clear
  B)
                  6, 5 done clear
  C)
                  7, 5         done clear
  D)
                  5, 7 done clear
  View Solution play_arrow

• question_answer10)
  The number of \[\alpha \] and \[\beta \]- particles emitted in the nuclear reaction \[_{90}T{{h}^{228}}{{\to }_{83}}B{{i}^{212}}\] are respectively [MNR 1992; MP PMT 1993; AFMC 1998, 2001; MH CET 1999; UPSEAT 2000, 01;  AMU 2001; CPMT 2002]
  A)
                  4, 1         done clear
  B)
                  3, 7 done clear
  C)
                  8, 1         done clear
  D)
                  4, 7 done clear
  View Solution play_arrow

• question_answer11)
  The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on \[\beta \]-emission and the parent nucleus is [EAMCET 1985; MNR 1992; Kurukshetra CEE 1998; UPSEAT 2000, 01]
  A)
                  \[8,\,{{C}^{14}}\]              done clear
  B)
                  \[6,\,{{C}^{12}}\] done clear
  C)
                  \[4,\,{{C}^{13}}\]              done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer12)
  After the emission of \[\alpha \]-particle from the atom \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be [MNR 1993; UPSEAT 1999, 2001, 02]
  A)
                  138         done clear
  B)
                  140 done clear
  C)
                  144         done clear
  D)
                  150 done clear
  View Solution play_arrow

• question_answer13)
  When a radioactive element emits an electron the daughter element formed will have [EAMCET 1988; MP PET 1994]
  A)
                  Mass number one unit less done clear
  B)
                  Atomic number one unit less done clear
  C)
                  Mass number one unit more done clear
  D)
                  Atomic number one unit more done clear
  View Solution play_arrow

• question_answer14)
  If the amount of radioactive substance is increased three times, the number of atoms disintegrated per unit time would                [MP PMT 1994]
  A)
                  Be double           done clear
  B)
                  Be triple done clear
  C)
                  Remain one third             done clear
  D)
                  Not change done clear
  View Solution play_arrow

• question_answer15)
  \[\beta \]-particles are emitted from the atom
  A)
                  Due to disintegration of neutron done clear
  B)
                  Due to disintegration of proton done clear
  C)
                  Due to removal of electron from \[K\] shell done clear
  D)
                  Due to removal of electron from outermost orbit done clear
  View Solution play_arrow

• question_answer16)
  \[Nd\,(Z=60)\] is a member of group -3 in periodic table. An isotope of it is \[\beta \]-active. The daughter nuclei will be a member of
  A)
                  Group -3              done clear
  B)
                  Group - 4 done clear
  C)
                  Group -1              done clear
  D)
                  Group ? 2 done clear
  View Solution play_arrow

• question_answer17)
  Number of neutrons in a parent nucleus \[X\], which gives \[_{7}{{N}^{14}}\] nucleus after two successive \[\beta \]  emissions would be [CBSE PMT 1998; MP PMT 2003]
  A)
                  9              done clear
  B)
                  8 done clear
  C)
                  7              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer18)
  The disintegration of an isotope of sodium. \[_{11}N{{a}^{24}}{{\to }_{12}}M{{g}^{24}}{{+}_{-1}}{{e}^{0}}\] shown is due to [AMU (Engg.) 2000]
  A)
                  The emission of b-radiation done clear
  B)
                  The formation of a stable nuclide done clear
  C)
                  The fall in the neutron : proton ratio done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer19)
  After losing a number of a and b-particles. \[_{92}{{U}^{238}}\] is changed to \[_{82}P{{b}^{206}}\]. The total number of a-particles lost in this process is     [UPSEAT 1999, 2000]
  A)
                  10           done clear
  B)
                  5 done clear
  C)
                  8              done clear
  D)
                  32 done clear
  View Solution play_arrow

• question_answer20)
  Which element is the end product of each natural radioactive series       [MP PMT 1996; MP PET/PMT 1998]
  A)
                  \[Sn\]    done clear
  B)
                  \[Bi\] done clear
  C)
                  \[Pb\]   done clear
  D)
                  \[C\] done clear
  View Solution play_arrow

• question_answer21)
  \[_{13}^{27}Al\] is a stable isotope. \[_{13}^{29}Al\] is expected to disintegrate by [IIT 1996; UPSEAT 2001]
  A)
                  \[\alpha \]-emission       done clear
  B)
                  \[\beta \]-emission done clear
  C)
                  Positron emission            done clear
  D)
                  Proton emission done clear
  View Solution play_arrow

• question_answer22)
  An isotope \[_{Y}{{A}^{X}}\] undergoes a series of \[m\]  alpha and \[n\] beta disintegration to form a stable isotope \[_{Y-10}{{B}^{X-32}}\].  The values of \[m\] and \[n\] are respectively              [MP PET 1995]
  A)
                  6 and 8  done clear
  B)
                  8 and 10 done clear
  C)
                  5 and 8  done clear
  D)
                  8 and 6 done clear
  View Solution play_arrow

• question_answer23)
  During a \[\beta \]-decay the mass of the atomic nucleus [MP PET 1996]
  A)
                  Decreases by one unit   done clear
  B)
                  Increases by one unit done clear
  C)
                  Decreases by two units done clear
  D)
                  Remains unaffected done clear
  View Solution play_arrow

• question_answer24)
  Which one of the following notations shows the product incorrectly        [MP PET/PMT 1998]
  A)
                  \[_{96}^{242}Cm\,(\alpha ,\,2n)\,_{97}^{243}Bk\]            done clear
  B)
                  \[_{5}^{10}B\,(\alpha ,\,n)\,_{7}^{13}N\] done clear
  C)
                  \[_{7}^{14}N\,(n,\,p)\,_{6}^{14}C\]         done clear
  D)
                  \[_{14}^{28}Si\,(d,\,n)\,_{15}^{29}P\] done clear
  View Solution play_arrow

• question_answer25)
  An atom has mass number 232 and atomic number 90. How many \[\alpha \]-particles should it emit after emission of two \[\beta \]-particles, so that the new element's atom has mass number 212 and atomic number 82
  A)
                  4              done clear
  B)
                  5 done clear
  C)
                  6              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer26)
  After the emission of one \[\alpha \]-particle followed by one \[\beta -\]particle from the atom of \[_{92}{{X}^{238}}\], the number of neutrons in the atom will be                [CBSE PMT 1995]
  A)
                  142         done clear
  B)
                  146 done clear
  C)
                  144         done clear
  D)
                  143 done clear
  View Solution play_arrow

• question_answer27)
  A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the \[\alpha -\]particles in succession. The group of the periodic table to which the resulting daughter element would belong is      [CBSE PMT 2005]
  A)
                  Gr.14     done clear
  B)
                  Gr.16 done clear
  C)
                  Gr.4       done clear
  D)
                  Gr.6 done clear
  View Solution play_arrow

• question_answer28)
  Which one of the following is not correct              [MP PMT 1997]
  A)
                  \[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\to {{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] done clear
  B)
                  \[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\to {{\,}_{20}}C{{a}^{45}}+{{\,}_{0}}{{n}^{1}}\] done clear
  C)
                  \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\to {{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] done clear
  D)
                  \[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\to {{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] done clear
  View Solution play_arrow

• question_answer29)
  The end product of \[(4n+2)\] radioactive disintegration series is [MP PET 1997; Pb. PMT 1998; BHU 2000]
  A)
                  \[_{82}P{{b}^{208}}\]     done clear
  B)
                  \[_{82}P{{b}^{206}}\] done clear
  C)
                  \[_{82}P{{b}^{207}}\]     done clear
  D)
                  \[_{83}B{{i}^{210}}\] done clear
  View Solution play_arrow

• question_answer30)
  The element 90Th232 belongs to thorium series. Which of the following will act as the end product of the series  [BHU 2005]
  A)
                  82Pb208  done clear
  B)
                  82Bi209 done clear
  C)
                  82Pb206  done clear
  D)
                  82Pb207 done clear
  View Solution play_arrow

• question_answer31)
  On bombarding \[_{8}{{O}^{16}}\] with deutrons, the nuclei of the product formed will be          [NCERT 1978]
  A)
                  \[_{9}{{F}^{18}}\]             done clear
  B)
                  \[_{9}{{F}^{17}}\] done clear
  C)
                  \[_{8}{{O}^{17}}\] done clear
  D)
                  \[_{7}{{N}^{14}}\] done clear
  View Solution play_arrow

• question_answer32)
  An element with atomic number 84 and mass number 218 loses one \[\alpha \]-particle and two \[\beta \]-particles in three successive stages, the resulting element will have [NCERT 1979; CPMT 1990]
  A)
                  At. no. 84 and mass number 214 done clear
  B)
                  At. no. 82 and mass number 214 done clear
  C)
                  At. no. 84 and mass number 218 done clear
  D)
                  At. no. 82 and mass number 218 done clear
  View Solution play_arrow

• question_answer33)
  Group displacement law was given by    [DPMT 1984]
  A)
                  Becquerel           done clear
  B)
                  Rutherford done clear
  C)
                  Soddy and Fajan               done clear
  D)
                  Madam Curie done clear
  View Solution play_arrow

• question_answer34)
  How many alpha particles are emitted in the nuclear transformation \[_{84}P{{o}^{215}}{{\xrightarrow{{}}}_{82}}P{{b}^{211}}\]          [CPMT 1993]
  A)
                  0              done clear
  B)
                  1 done clear
  C)
                  2              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer35)
  If uranium (mass no. 238 and atomic no. 92) emits \[\alpha \]-particle, the product has mass number and atomic number [CPMT 1984, 90, 93, 94; MNR 1991; IIT 1981]
  A)
                  234,  90 done clear
  B)
                  236,  92 done clear
  C)
                  238,  90 done clear
  D)
                  236,  90 done clear
  View Solution play_arrow

• question_answer36)
  Initial mass of a radioactive element is 40 g. How many grams of it would be left after 24 years, if its    half-life period is 8 years     [MP PMT 1985]
  A)
                  2              done clear
  B)
                  5 done clear
  C)
                  10 done clear
  D)
                  20 done clear
  View Solution play_arrow

• question_answer37)
  What is the symbol for the nucleus remaining after \[_{20}C{{a}^{42}}\] undergoes \[\beta \]-emission [MNR 1987; UPSEAT 2000, 02]
  A)
                  \[_{21}C{{a}^{42}}\]        done clear
  B)
                  \[_{20}S{{c}^{42}}\] done clear
  C)
                  \[_{21}S{{c}^{42}}\]        done clear
  D)
                  \[_{21}S{{c}^{41}}\] done clear
  View Solution play_arrow

• question_answer38)
  When a radioactive nucleus emits an \[\alpha \]-particle, the mass of the atom                 [NCERT 1973, 82]
  A)
                  Increases and its at. number decreases done clear
  B)
                  Decreases and its at. number decreases done clear
  C)
                  Decreases and its at. number increases done clear
  D)
                  Remains same and its at. number decreases done clear
  View Solution play_arrow

• question_answer39)
  A photon of hard gamma radiation knocks a proton out of \[_{12}^{24}Mg\] nucleus to form      [AIEEE 2005]
  A)
                  The isotope of parent nucleus done clear
  B)
                  The isobar of parent nucleus done clear
  C)
                  The nuclide \[_{11}^{23}Na\] done clear
  D)
                  The isobar of \[_{11}^{23}Na\] done clear
  View Solution play_arrow

• question_answer40)
  \[_{84}P{{b}^{210}}{{\xrightarrow{{}}}_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\]. From the above equation, deduce the position of polonium in the periodic table (lead belongs to group IV A)   [AIIMS 1980]
  A)
                  II A         done clear
  B)
                  IV B done clear
  C)
                  VI B        done clear
  D)
                  VI A done clear
  View Solution play_arrow

• question_answer41)
  Whenever the parent nucleus emits a b-particle, the daughter element is shifted in the periodic table   [NCERT 1984]
  A)
                  One place to the right done clear
  B)
                  One place to the left done clear
  C)
                  Two places to the right done clear
  D)
                  Two places to the left done clear
  View Solution play_arrow

• question_answer42)
  In the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}\], the number of alpha and beta particles decayed are [DPMT 1983; MNR 1985; Roorkee Qualifying 1998]
  A)
                  \[4\alpha ,\,3\beta \]     done clear
  B)
                  \[8\alpha ,\,6\beta \] done clear
  C)
                  \[6\alpha ,\,4\beta \]     done clear
  D)
                  \[7\alpha ,\,5\beta \] done clear
  View Solution play_arrow

• question_answer43)
  Atomic number after a \[\beta \]-emission from a nucleus having  atomic number 40, will be      [BHU 1981]
  A)
                  36           done clear
  B)
                  39 done clear
  C)
                  41           done clear
  D)
                  44 done clear
  View Solution play_arrow

• question_answer44)
  A certain nuclide has a half-life period of 30 minutes. If a sample containing 600 atoms is allowed to decay for 90 minutes, how many atoms will remain      [NCERT 1978]
  A)
                  200 atoms           done clear
  B)
                  450 atoms done clear
  C)
                  75 atoms              done clear
  D)
                  500 atoms done clear
  View Solution play_arrow

• question_answer45)
  The reaction which disintegrates neutron is or neutron is emitted (which completes first) [IIT 1988; MP PMT 1991; KCET 2005]
  A)
                  \[_{96}A{{m}^{240}}{{+}_{2}}H{{e}^{4}}\to {{}_{97}}B{{k}^{244}}+{{}_{+1}}{{e}^{0}}\] done clear
  B)
                  \[_{15}{{P}^{30}}\to {{\ }_{14}}S{{i}^{30}}+{{\ }_{1}}{{e}^{0}}\] done clear
  C)
                  \[_{6}{{C}^{12}}+{{\ }_{1}}{{H}^{1}}\to {{\ }_{7}}{{N}^{13}}\] done clear
  D)
                  \[_{13}A{{l}^{27}}+{{\ }_{2}}H{{e}^{4}}\to {{\ }_{15}}{{P}^{30}}\] done clear
  View Solution play_arrow

• question_answer46)
  If \[_{92}{{U}^{236}}\] nucleus emits one \[\alpha \]-particle, the remaining nucleus will have [MP PMT 1976, 80; BHU 1985; CPMT 1980]
  A)
                  119 neutrons and 119 protons done clear
  B)
                  142 neutrons and 90 protons done clear
  C)
                  144 neutrons and 92 protons done clear
  D)
                  146 neutrons and 90 protons done clear
  View Solution play_arrow

• question_answer47)
  \[\alpha \]-rays have high ionization power because they possess [CPMT 1982]
  A)
                  Lesser kinetic energy done clear
  B)
                  Higher kinetic energy done clear
  C)
                  Lesser penetrating power done clear
  D)
                  Higher penetrating power done clear
  View Solution play_arrow

• question_answer48)
  When radium atom which is placed in II group, loses an \[\alpha \]- particle, a new element is formed which should be placed in group [CPMT 1979, 80, 94; NCERT 1979, 82]
  A)
                  Second done clear
  B)
                  First done clear
  C)
                  Fourth  done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer49)
  Starting from radium, the radioactive disintegration process terminates when the following is obtained [CPMT 1979]
  A)
                  Lead      done clear
  B)
                  Radon done clear
  C)
                  Radium A             done clear
  D)
                  Radium B done clear
  View Solution play_arrow

• question_answer50)
  The appreciable radioactivity of uranium minerals is mainly due to            [NCERT 1980]
  A)
                  An uranium isotope of mass number 235 done clear
  B)
                  A thorium isotope of mass number 232 done clear
  C)
                  Actinium done clear
  D)
                  Radium done clear
  View Solution play_arrow

• question_answer51)
  After losing a number of \[\alpha \]and \[\beta \]-particles, \[_{92}{{U}^{238}}\] changed to \[_{82}P{{b}^{206}}\]. The total number of particles lost in this process is    [MNR 1985]
  A)
                  14           done clear
  B)
                  5 done clear
  C)
                  8              done clear
  D)
                  32 done clear
  View Solution play_arrow

• question_answer52)
  When an radioactive element emits an alpha particle, the daughter element is placed in the periodic table [MP PET 1991; MADT Bihar 1981]
  A)
                  Two positions to the left of the parent element done clear
  B)
                  Two positions to the right of the parent element done clear
  C)
                  One position to the right of the parent element done clear
  D)
                  In the same position as the parent element done clear
  View Solution play_arrow

• question_answer53)
  If the quantity of a radioactive element is doubled, then its rate of disintegration  per unit time will be [NCERT 1972, 92; MP PET 1989]
  A)
                  Unchanged done clear
  B)
                  Reduced to half done clear
  C)
                  Increased by \[\sqrt{2}\]times done clear
  D)
                  Doubled done clear
  View Solution play_arrow

• question_answer54)
  The number of a and b -particles emitted during the transformation of \[_{90}T{{h}^{232}}\] to \[_{82}{{P}^{208}}\] are respectively   [MNR 1978; NCERT 1984;CPMT 1989; RPET 1999; MP PMT  2001; KCET 2003]
  A)
                  4, 2         done clear
  B)
                  2, 2 done clear
  C)
                  8, 6         done clear
  D)
                  6, 4 done clear
  View Solution play_arrow

• question_answer55)
  The atomic number of a radioactive element increases by one unit in                                     [EAMCET 1997]
  A)
                  Alpha emission done clear
  B)
                  Beta emission done clear
  C)
                  Gamma emission             done clear
  D)
                  Electron capture done clear
  View Solution play_arrow

• question_answer56)
  The end product of \[(4n+1)\] radioactive disintegration series is              [MP PMT 1999]
  A)
                  \[_{83}B{{i}^{209}}\]       done clear
  B)
                  \[_{84}P{{o}^{210}}\] done clear
  C)
                  \[_{82}P{{b}^{208}}\]     done clear
  D)
                  \[_{82}P{{b}^{207}}\] done clear
  View Solution play_arrow

• question_answer57)
  When a \[\beta \]-particle emits from the atom of an element, then [MP PET 1990]
  A)
                  Atomic number increases by two units done clear
  B)
                  Atomic number increases by three units done clear
  C)
                  Atomic number decreases by one unit done clear
  D)
                  Atomic number increases by one unit done clear
  View Solution play_arrow

• question_answer58)
  The number of b-particles emitted in radioactive change \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}{{+}_{2}}H{{e}^{4}}\] is                [KCET 2000]
  A)
                  2              done clear
  B)
                  4 done clear
  C)
                  6              done clear
  D)
                  10 done clear
  View Solution play_arrow

• question_answer59)
  If half-life of a certain radioactive nucleus is \[1000\,s,\] the disintegration constant is     [MP PET 2001]
  A)
                  \[6.93\times {{10}^{2}}{{s}^{-1}}\]            done clear
  B)
                  \[6.93\times {{10}^{-4}}s\] done clear
  C)
                  \[6.93\times {{10}^{-4}}{{s}^{-1}}\]          done clear
  D)
                  \[6.93\times {{10}^{3}}s\] done clear
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• question_answer60)
  Radioactivity of naptunium stops when it is converted to [JIPMER 2001]
  A)
                  Bi            done clear
  B)
                  Rn done clear
  C)
                  Th           done clear
  D)
                  Pb done clear
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• question_answer61)
  The highest binding energy per nucleon will be for [AIIMS 2001]
  A)
                  Fe           done clear
  B)
                  \[{{H}_{2}}\] done clear
  C)
                  \[{{O}_{2}}\]      done clear
  D)
                  U done clear
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• question_answer62)
  In the Thorium series, \[_{90}Th{{}^{232}}\] loses total of 6 a-particles and 4 b-particles in ten stages. The final isotope produced in the series is               [MP PET 2001]
  A)
                  \[_{82}P{{b}^{209}}\]     done clear
  B)
                  \[_{83}B{{i}^{209}}\] done clear
  C)
                  \[_{82}P{{b}^{208}}\]     done clear
  D)
                  \[_{82}P{{b}^{206}}\] done clear
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• question_answer63)
  All the nuclei from the initial element to the final element constitute a series which is called        [Kerala (Med.) 2002]
  A)
                  g-series                done clear
  B)
                  b-series done clear
  C)
                  b-g series            done clear
  D)
                  Disintegration series done clear
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• question_answer64)
  The number of neutrons in the parent nucleus which gives \[{{N}^{14}}\] on b ? emission is        [Pb.CET 2004]
  A)
                  7              done clear
  B)
                  14 done clear
  C)
                  6              done clear
  D)
                  8 done clear
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• question_answer65)
  The nuclear binding energy for \[Ar\](39.962384 amu) is: (given mass of proton and neutron are 1.007825 amu and 1.008665 amu respectively)         [Pb.CET 2002]
  A)
                  \[343.81\ MeV\]               done clear
  B)
                  \[0.369096\ MeV\] done clear
  C)
                  \[931\ MeV\]     done clear
  D)
                  None of these done clear
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• question_answer66)
  The number \[\alpha -\]and \[\beta \]- particles emitted respectively during the transformation of \[_{90}^{232}Th\ \text{to}\ _{82}^{208}Pb\]is [Kerala PMT 2004]
  A)
                  3, 6         done clear
  B)
                  6, 3 done clear
  C)
                  4, 6         done clear
  D)
                  6, 4 done clear
  E)
                  6, 8 done clear
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• question_answer67)
  Consider the following nuclear reactions, \[_{92}^{238}M\to \,_{y}^{x}N+2\,_{2}^{4}He\]                 \[_{y}^{x}N\to \,_{B}^{A}L+2{{\beta }^{+}}\]                 The number of neutrons in the element L is        [AIEEE 2004]
  A)
                  140         done clear
  B)
                  144 done clear
  C)
                  142         done clear
  D)
                  146 done clear
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• question_answer68)
  The number of \[\alpha -\]and \[\beta -\]particles emitted when a radioactive element \[_{90}{{E}^{232}}\] changes into \[_{86}{{G}^{220}}\] will be   [MP PET 2004]
  A)
                  5 and 4 done clear
  B)
                  2 and 3 done clear
  C)
                  3 and 2  done clear
  D)
                  4 and 1 done clear
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• question_answer69)
  The disintegration constant of radium with half-life 1600 years is               [MHCET 2004]
  A)
                  \[2.12\times {{10}^{-4}}yea{{r}^{-1}}\]   done clear
  B)
                  \[4.33\times {{10}^{-4}}yea{{r}^{-1}}\] done clear
  C)
                  \[3.26\times {{10}^{-3}}yea{{r}^{-1}}\]   done clear
  D)
                  \[4.33\times {{10}^{-12}}yea{{r}^{-1}}\] done clear
  View Solution play_arrow

• question_answer70)
  The number of \[\alpha \] and \[\beta -\]particles emitted in the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{90}}T{{h}^{234}}{{\to }_{91}}P{{a}^{234}}\]are respectively [Pb.CET 2001]
  A)
                  1 and 1  done clear
  B)
                  1 and 2 done clear
  C)
                  2 and 1  done clear
  D)
                  2 and 2 done clear
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• question_answer71)
  In which radiation mass number and atomic number will not change       [JEE Orissa 2004]
  A)
                  \[\alpha \]           done clear
  B)
                  \[\beta \] done clear
  C)
                  \[\gamma \]       done clear
  D)
                  \[\alpha \] and \[2\beta \] done clear
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• question_answer72)
  Disintegration constant for a radioactive substance is 0.58\[h{{r}^{-1}}\]. Its half-life period          [BHU 2004]
  A)
                  8.2 hr     done clear
  B)
                  5.2 hr done clear
  C)
                  1.2 hr     done clear
  D)
                  2.4 hr done clear
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• question_answer73)
  A radioactive nucleus will not emit           [DPMT 2005]
  A)
                  Alpha and beta rays simultaneously done clear
  B)
                  Beta  and gamma rays simultaneously done clear
  C)
                  Gamma and alpha rays done clear
  D)
                  Gamma rays only done clear
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• question_answer74)
  \[_{72}^{180}X\xrightarrow{2\alpha }\xrightarrow{\beta }\xrightarrow{\gamma }\,_{Z}^{A}{X}'\].\[Z\] and \[A\]are                [DPMT 2005]
  A)
                  69, 172  done clear
  B)
                  172, 69 done clear
  C)
                  180, 70  done clear
  D)
                  182, 68 done clear
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• question_answer75)
  Loss of a beta particle is equivalent to    [J & K 2005]
  A)
                  Increase of one neutron only done clear
  B)
                  Decrease of one neutron only done clear
  C)
                  Both A and B done clear
  D)
                  None of these done clear
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