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

done Nucleus (Stability and Reaction) Total Questions - 68

• question_answer1)
  Nucleons are     [CPMT 1982]
  A)
                  Protons and electrons done clear
  B)
                  Protons and neutrons done clear
  C)
                  Electrons and neutrons done clear
  D)
                  Electrons, protons and neutrons done clear
  View Solution play_arrow

• question_answer2)
  A deutron contains         [NCERT 1982; CPMT 1994]
  A)
                  A neutron and a positron done clear
  B)
                  A neutron and a proton done clear
  C)
                  A neutron and two protons done clear
  D)
  A proton and two neutrons done clear
  View Solution play_arrow

• question_answer3)
  The nucleus of radioactive element possesses
  A)
                  Low binding energy        done clear
  B)
                  High binding energy done clear
  C)
                  Zero binding energy       done clear
  D)
                  High potential energy done clear
  View Solution play_arrow

• question_answer4)
  On bombarding \[_{7}{{N}^{14}}\] with \[\alpha \]-particles, the nuclei of the product formed after the release of a proton will be or In nuclear reaction \[_{7}{{N}^{14}}+{{\,}_{2}}H{{e}^{4}}{{\to }_{Z}}{{X}^{A}}{{+}_{1}}{{H}^{1}}\], the term \[_{Z}{{X}^{A}}\] represents       [NCERT 1979; MP PMT 1989; MNR 1995; MP PET 1996; BHU 1996]
  A)
                  \[_{8}{{O}^{17}}\]            done clear
  B)
                  \[_{9}{{F}^{18}}\] done clear
  C)
                  \[_{9}{{F}^{17}}\]             done clear
  D)
                  \[_{8}{{O}^{18}}\] done clear
  View Solution play_arrow

• question_answer5)
  Nuclear energy is based on the conversion of
  A)
  Protons into neutrons done clear
  B)
  Mass into energy done clear
  C)
  Neutrons into protons done clear
  D)
  Uranium into radium done clear
  View Solution play_arrow

• question_answer6)
  Positron has nearly the same weight as that of [NCERT 1975; JIPMER 1991; BHU 1995]
  A)
                  \[\alpha \]-particle          done clear
  B)
                  Proton done clear
  C)
                  Neutron               done clear
  D)
                  Electron done clear
  View Solution play_arrow

• question_answer7)
  In the reaction \[_{3}L{{i}^{6}}+(?)\to {{\ }_{2}}H{{e}^{4}}+{{\ }_{1}}{{H}^{3}}\]. The missing particle is                                     [CPMT 1983, 84]
  A)
                  Electron               done clear
  B)
                  Neutron done clear
  C)
                  Proton  done clear
  D)
                  Deutron done clear
  View Solution play_arrow

• question_answer8)
  The \[_{6}{{C}^{14}}\] in upper atmosphere is generated by the nuclear reaction                                              [MP PET 1993]
  A)
                  \[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{+1}}{{e}^{0}}+{{\ }_{1}}{{H}^{1}}\] done clear
  B)
                  \[_{7}{{N}^{14}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{+1}}{{e}^{0}}\] done clear
  C)
                  \[_{7}{{N}^{14}}+{{\ }_{0}}{{n}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{1}}{{H}^{1}}\] done clear
  D)
                  \[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{3}}+{{\ }_{0}}{{n}^{1}}\xrightarrow{{}}{{\ }_{6}}{{C}^{14}}+{{\ }_{2}}H{{e}^{4}}\] done clear
  View Solution play_arrow

• question_answer9)
  Deuterons when bombarded on a nuclide produce \[_{18}A{{r}^{38}}\] and neutrons. The target is         [CPMT 1982, 87]
  A)
                  \[_{17}C{{l}^{35}}\]         done clear
  B)
                  \[_{19}{{K}^{27}}\] done clear
  C)
                  \[_{17}C{{l}^{37}}\]         done clear
  D)
                  \[_{19}{{K}^{39}}\] done clear
  View Solution play_arrow

• question_answer10)
  Which can be used for carrying out nuclear reaction [AFMC 2003]
  A)
                  Uranium ? 238   done clear
  B)
                  Neptunium ? 239 done clear
  C)
                  Thorium ? 232   done clear
  D)
                  Plutonium ? 239 done clear
  View Solution play_arrow

• question_answer11)
  On comparing chemical reactivity of \[{{C}^{12}}\] and \[{{C}^{14}}\], it is revealed that
  A)
                  \[{{C}^{12}}\] is more reactive   done clear
  B)
                  \[{{C}^{14}}\] is more reactive done clear
  C)
                  Both are inactive              done clear
  D)
                  Both are equally active done clear
  View Solution play_arrow

• question_answer12)
  The radionucleide \[_{90}^{234}Th\] undergoes two successive \[\beta \]-decays followed by one \[\alpha \]-decay. The atomic number and the mass number respectively of the resulting radionucleide are                      [AIEEE 2003]
  A)
                  92 and 234           done clear
  B)
                  94 and 230 done clear
  C)
                  90 and 230           done clear
  D)
                  92 and 230 done clear
  View Solution play_arrow

• question_answer13)
  Hydrogen  and deuterium differ in           [CPMT 1980]
  A)
                  Reactivity with oxygen done clear
  B)
                  Reactivity with chlorine done clear
  C)
                  Melting point     done clear
  D)
                  Reducing action done clear
  View Solution play_arrow

• question_answer14)
  A nuclear reaction must be balanced in terms of
  A)
                  Only energy       done clear
  B)
                  Only mass done clear
  C)
                  Mass and energy             done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer15)
  In the following nuclear reaction, the other product is \[_{52}T{{e}^{130}}{{+}_{1}}{{H}^{2}}{{\xrightarrow{{}}}_{53}}{{I}^{131}}+?\]      [MP PET 1991]
  A)
                  Positron               done clear
  B)
                  Alpha particle done clear
  C)
                  One neutron      done clear
  D)
                  Proton done clear
  View Solution play_arrow

• question_answer16)
  The reaction \[_{5}{{B}^{8}}{{\to }_{4}}B{{e}^{8}}{{+}_{1}}{{e}^{0}}\]  is due to   [MP PMT 1991]
  A)
                  Loss of \[\alpha \]-particles         done clear
  B)
                  Loss of \[\beta \]-particles done clear
  C)
                  Loss of positron                done clear
  D)
                  Electron loss done clear
  View Solution play_arrow

• question_answer17)
  Positronium is the name given to an atom-like combination formed between     [NCERT 1980; JIPMER 1991]
  A)
                  A positron and a proton done clear
  B)
                  A positron and a neutron done clear
  C)
                  A positron and \[\alpha \]-particle done clear
  D)
                  A positron and an electron done clear
  View Solution play_arrow

• question_answer18)
  An electrically charged atom or a group of atoms is known as                      [BHU 1979]
  A)
                  A meson              done clear
  B)
                  A proton done clear
  C)
                  An ion   done clear
  D)
                  A cyclotron done clear
  View Solution play_arrow

• question_answer19)
  The charge on positron is equal to the charge on which one of the following        [NCERT 1977]
  A)
                  Proton  done clear
  B)
                  Electron done clear
  C)
                  \[\alpha \]-particle          done clear
  D)
                  Neutron done clear
  View Solution play_arrow

• question_answer20)
  In the nuclear reaction \[_{12}M{{g}^{24}}{{+}_{2}}H{{e}^{4}}{{=}_{0}}{{n}^{1}}+?\] The product nucleus is          [BHU 1987]
  A)
                  \[_{13}A{{l}^{27}}\]         done clear
  B)
                  \[_{14}S{{i}^{27}}\] done clear
  C)
                  \[_{13}A{{l}^{28}}\]         done clear
  D)
                  \[_{12}M{{g}^{25}}\] done clear
  View Solution play_arrow

• question_answer21)
  \[_{6}{{C}^{14}}\] is formed from \[_{7}{{N}^{14}}\] in the upper atmosphere by the action of the fundamental particle      [Orissa JEE 2002]
  A)
                  Positron               done clear
  B)
                  Neutron done clear
  C)
                  Electron               done clear
  D)
                  Proton done clear
  View Solution play_arrow

• question_answer22)
  In the nuclear reaction \[_{92}{{U}^{238}}{{\to }_{82}}P{{b}^{206}}+x{{\,}_{2}}H{{e}^{4}}+y{{\,}_{-1}}{{\beta }^{0}}\] the value of x and y are respectively ??..  [Orissa JEE 2002]
  A)
                  8, 6         done clear
  B)
                  6, 4 done clear
  C)
                  6, 8         done clear
  D)
                  8, 10 done clear
  View Solution play_arrow

• question_answer23)
  If an isotope of hydrogen has two neutrons in its atom, its atomic number and atomic mass number will respectively be                [CBSE 1992]
  A)
                  2 and 1  done clear
  B)
                  3 and 1 done clear
  C)
                  1 and 1  done clear
  D)
                  1 and 3 done clear
  View Solution play_arrow

• question_answer24)
  Which one of the following nuclear transformation is (n, p ) type              [AIIMS 1980, 83]
  A)
                  \[_{3}L{{i}^{7}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{4}}B{{e}^{7}}+{{\,}_{0}}{{n}^{1}}\] done clear
  B)
                  \[_{33}A{{s}^{75}}+{{\,}_{2}}H{{e}^{4}}\xrightarrow{{}}{{\,}_{35}}B{{r}^{78}}+{{\,}_{0}}{{n}^{1}}\] done clear
  C)
                  \[_{83}B{{i}^{209}}+{{\,}_{1}}{{H}^{2}}\xrightarrow{{}}{{\,}_{84}}P{{o}^{210}}+{{\,}_{0}}{{n}^{1}}\] done clear
  D)
                  \[_{21}S{{c}^{45}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{20}}C{{a}^{45}}+{{\,}_{1}}{{H}^{1}}\] done clear
  View Solution play_arrow

• question_answer25)
  What is X in the following nuclear reaction                 \[_{7}{{N}^{14}}+{{\ }_{1}}{{H}^{1}}{{\xrightarrow{{}}}_{8}}{{O}^{15}}+X\]            [AIIMS 1983; MP PET 1997]
  A)
                  \[_{+1}{{e}^{0}}\]            done clear
  B)
                  \[_{0}{{n}^{1}}\] done clear
  C)
                  \[\gamma \]       done clear
  D)
                  \[_{-1}{{e}^{0}}\] done clear
  View Solution play_arrow

• question_answer26)
  In the reaction \[_{93}N{{p}^{239}}{{\xrightarrow{{}}}_{94}}P{{u}^{239}}\] + (?), the missing particle is   [MNR 1987]
  A)
                  Proton                  done clear
  B)
                  Positron done clear
  C)
                  Electron               done clear
  D)
                  Neutron done clear
  View Solution play_arrow

• question_answer27)
  According to the nuclear reaction \[_{4}Be{{+}_{2}}H{{e}^{4}}{{\to }_{6}}{{C}^{12}}{{+}_{0}}n{{}^{1}}\], mass number of \[(Be)\] atom is [AFMC 2002]
  A)
                  4              done clear
  B)
                  9 done clear
  C)
                  7              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer28)
  Which of the following nuclides has the magic number of both protons and neutrons     [EAMCET 1989]
  A)
                  \[_{50}S{{n}^{115}}\]     done clear
  B)
                  \[_{82}P{{b}^{206}}\] done clear
  C)
                  \[_{82}P{{b}^{208}}\] done clear
  D)
                  \[_{50}S{{n}^{118}}\] done clear
  View Solution play_arrow

• question_answer29)
  In the carbon cycle, from which hot stars obtain their energy, the \[_{6}{{C}^{14}}\] nucleus  is
  A)
                  Completely converted into energy done clear
  B)
                  Regenerated at the end of the cycle done clear
  C)
                  Combined with oxygen to form carbon monoxide done clear
  D)
                  Broken up into its constituents protons and neutrons done clear
  View Solution play_arrow

• question_answer30)
  The atomic mass of lead is 208 and atomic number is 82. The atomic mass of bismuth is 209 and atomic number is 83. The ratio of n/p in the atom is             [EAMCET 1982]
  A)
                  Higher of lead    done clear
  B)
                  Higher of bismuth done clear
  C)
                  Same     done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer31)
  Which of the following is an \[n,\,p\] reaction    [BHU 1995]
  A)
                  \[_{5}{{C}^{13}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{6}}{{C}^{14}}\] done clear
  B)
                  \[_{7}{{N}^{14}}+{{\,}_{1}}{{H}^{1}}\xrightarrow{{}}{{\,}_{8}}{{O}^{15}}\] done clear
  C)
                  \[_{13}A{{l}^{27}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{12}}M{{g}^{27}}+{{\,}_{1}}{{H}^{1}}\] done clear
  D)
        \[_{92}{{U}^{235}}+{{\,}_{0}}{{n}^{1}}\xrightarrow{{}}{{\,}_{54}}X{{e}^{140}}+{{\,}_{38}}S{{r}^{93}}+3{{\,}_{0}}{{n}^{1}}\] done clear
  View Solution play_arrow

• question_answer32)
  Which one of the following statements is incorrect [MP PET 1997]
  A)
                  Mass defect is related with binding energy done clear
  B)
                  ?Meson? was discovered by Yukawa done clear
  C)
                  The size of the nucleus is of the order of \[{{10}^{-12}}-{{10}^{-13}}cm\] done clear
  D)
                  Magnetic quantum number is a measure of ?orbital angular momentum? of the electron done clear
  View Solution play_arrow

• question_answer33)
  In the sequence of following nuclear reactions \[_{92}{{X}^{238}}\xrightarrow{-\alpha }Y\xrightarrow{-\beta }Z\xrightarrow{-\beta }L{{\xrightarrow{-n\alpha }}_{84}}{{M}^{218}}\]                 The value of \[n\] will be                                              [MP PMT 1999]
  A)
                  3              done clear
  B)
                  4 done clear
  C)
                  5              done clear
  D)
                  6 done clear
  View Solution play_arrow

• question_answer34)
  The introduction of a neutron into the nuclear composition of an atom would lead to a change in [MNR 1995]
  A)
                  The number of the electrons also done clear
  B)
                  The chemical nature of the atom done clear
  C)
                  Its atomic number done clear
  D)
                  Its atomic weight done clear
  View Solution play_arrow

• question_answer35)
  The composition of tritium (\[_{1}{{H}^{3}}\]) is [Manipal MEE 1995; DPMT 1982,96]
  A)
                  1 electron, 1 proton, 1 neutron done clear
  B)
                  1 electron, 2 protons, 1 neutron done clear
  C)
                  1 electron, 1 proton, 2 neutrons done clear
  D)
                  1 electron, 1 proton, 3 neutrons done clear
  View Solution play_arrow

• question_answer36)
  Identify \['X'\] in \[_{16}{{S}^{32}}+X\to {{\,}_{15}}{{P}^{30}}+{{\,}_{2}}H{{e}^{4}}\]
  A)
                  \[_{1}{{H}^{1}}\]              done clear
  B)
                  \[_{1}{{D}^{2}}\] done clear
  C)
                  \[_{0}{{n}^{1}}\]               done clear
  D)
                  \[{{e}^{-}}\] done clear
  View Solution play_arrow

• question_answer37)
  In terms of energy 1 a. m.u. is equal to [MP PET/PMT 1998]
  A)
                  100 J      done clear
  B)
                  931.1 MeV done clear
  C)
                  931.1 kcal            done clear
  D)
                  \[{{10}^{7}}\]erg done clear
  View Solution play_arrow

• question_answer38)
  Positron is           [AIIMS 1997]
  A)
                  Electron with +ve  charge done clear
  B)
                  A helium nucleus done clear
  C)
                  A nucleus with two protons done clear
  D)
                  A nucleus with one neutron and one proton done clear
  View Solution play_arrow

• question_answer39)
  \[X\xrightarrow{-\alpha }Y\xrightarrow{-\beta }Z\xrightarrow{-\beta }W\]                 In the above sequence of reaction, the elements which are isotopes of each other are  [JIPMER 1997]
  A)
                  \[X\] and \[W\]                 done clear
  B)
                  \[Y\] and \[Z\] done clear
  C)
                  \[X\] and \[Z\]   done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer40)
  Stable nuclides are those whose n/p ratio is        [MP PMT 1993]
  A)
                  \[n/p=1\]            done clear
  B)
                  \[n/p=2\] done clear
  C)
                  \[n/p>1\]            done clear
  D)
                  \[n/p<1\] done clear
  View Solution play_arrow

• question_answer41)
  Neutrino has                                      [NCERT 1981]
  A)
                  Charge +1,  mass 1           done clear
  B)
                  Charge 0,  mass 0 done clear
  C)
                  Charge ? 1, mass 1 done clear
  D)
                  Charge 0 , mass 1 done clear
  View Solution play_arrow

• question_answer42)
  Which one of the following nuclear reaction is correct [CPMT 1997]
  A)
                  \[_{6}{{C}^{13}}{{+}_{1}}{{H}^{1}}{{\to }_{7}}{{N}^{13}}+{{\beta }^{-}}+{{v}^{-}}\] done clear
  B)
                  \[_{11}N{{a}^{23}}{{+}_{1}}{{H}^{1}}\to {{\ }_{10}}N{{e}^{20}}+{{\ }_{2}}H{{e}^{4}}\] done clear
  C)
                  \[_{13}A{{l}^{23}}+{{\ }_{0}}{{n}^{1}}\to {{\ }_{11}}N{{a}^{23}}+{{e}^{0}}\] done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer43)
  Formation of nucleus from its nucleons is accompanied by [NCERT 1975; RPET 2000]
  A)
                  Decrease in mass             done clear
  B)
                  Increase in mass done clear
  C)
                  No change of mass          done clear
  D)
                  None of them done clear
  View Solution play_arrow

• question_answer44)
  A particle having the same charge and 200 times greater mass than that of electron is
  A)
                  Positron               done clear
  B)
                  Proton done clear
  C)
                  Neutrino              done clear
  D)
                  Meson done clear
  View Solution play_arrow

• question_answer45)
  The positron is                                  [AFMC 1997]
  A)
                  \[_{-1}{{e}^{0}}\]             done clear
  B)
                  \[_{+1}{{e}^{0}}\] done clear
  C)
                  \[_{1}{{H}^{1}}\]              done clear
  D)
                  \[_{0}{{n}^{1}}\] done clear
  View Solution play_arrow

• question_answer46)
  Which of the following is the most stable atom [AFMC 1997]
  A)
                  \[Bi\]     done clear
  B)
                  \[Al\] done clear
  C)
                  \[U\]     done clear
  D)
                  \[Pb\] done clear
  View Solution play_arrow

• question_answer47)
  The positron is discovered by     [RPMT 1997]
  A)
                  Pauling done clear
  B)
                  Anderson done clear
  C)
                  Yukawa                done clear
  D)
                  Segar done clear
  View Solution play_arrow

• question_answer48)
  The nucleus of an atom is made up of X protons and Y neutrons. For the most stable and abundant nuclei [NCERT 1980]
  A)
                  X and Y are both even    done clear
  B)
                  X and Y are both odd done clear
  C)
                  X is even and Y is odd     done clear
  D)
                  X is odd and Y is even done clear
  View Solution play_arrow

• question_answer49)
  Atom A possesses higher values of packing fraction than atom B. The relative stabilities of A and B are
  A)
                  A is more stable than B done clear
  B)
                  B is more stable than A done clear
  C)
                  A and B both are equally stable done clear
  D)
                  Stability does not depend on packing fraction done clear
  View Solution play_arrow

• question_answer50)
  How many neutrons are present in the nucleus of \[Ra\] [CPMT 1980]
  A)
                  88           done clear
  B)
                  226 done clear
  C)
                  140         done clear
  D)
                  138 done clear
  View Solution play_arrow

• question_answer51)
  In a nuclear explosion, the energy is released in the form of [CPMT 1994]
  A)
                  Kinetic energy   done clear
  B)
                  Electrical energy done clear
  C)
                  Potential energy              done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer52)
  In equation \[_{11}N{{a}^{23}}{{+}_{1}}{{H}^{1}}{{\to }_{12}}M{{g}^{23}}+x\], \[x\]  represents [MP PMT 1990; MP PET 1999]
  A)
                  Neutron               done clear
  B)
                  Deutron done clear
  C)
                  \[\alpha \]-particle          done clear
  D)
                  Positron done clear
  View Solution play_arrow

• question_answer53)
  Which of the following atomic mass of uranium is the most radioactive                                  [AFMC 1997]
  A)
                  238         done clear
  B)
                  235 done clear
  C)
                  226         done clear
  D)
                  248 done clear
  View Solution play_arrow

• question_answer54)
  Which of the following particle is emitted in the reaction \[_{13}A{{l}^{27}}{{+}_{2}}H{{e}^{4}}{{\to }_{14}}{{P}^{30}}+.....\]                [DCE 1999]
  A)
                  \[_{0}{{n}^{1}}\]               done clear
  B)
                  \[_{-1}{{e}^{0}}\] done clear
  C)
                  \[_{1}{{H}^{1}}\]              done clear
  D)
                  \[_{1}{{H}^{2}}\] done clear
  View Solution play_arrow

• question_answer55)
  Which of the following sub-atomic particles is not present in an atom                                           [JIPMER 1999]
  A)
                  Neutron               done clear
  B)
                  Proton done clear
  C)
                  Electron               done clear
  D)
                  Positron done clear
  View Solution play_arrow

• question_answer56)
  Electromagnetic radiation with maximum wave length is [DCE 2000; UPSEAT 2000]
  A)
                  Ultraviolet ray   done clear
  B)
                  Radiowave done clear
  C)
                  X-ray     done clear
  D)
                  Infrared done clear
  View Solution play_arrow

• question_answer57)
  Neutrons are obtained by             [JIPMER 1999]
  A)
                  Bombardment of Ra with b-particles done clear
  B)
                  Bombardment of Be with a-particles done clear
  C)
                  Radioactive disintegration of uranium done clear
  D)
                  None of these done clear
  View Solution play_arrow

• question_answer58)
  In the reaction, \[Po\xrightarrow{-\alpha }Pb\xrightarrow{-\beta }Bi,\,\] if Bi, belongs to group 15, to which Po belongs                 [DCE 2000]
  A)
                  14           done clear
  B)
                  15 done clear
  C)
                  13           done clear
  D)
                  16 done clear
  View Solution play_arrow

• question_answer59)
  In the nuclear reaction \[_{4}^{9}Be(p,\,\alpha )\,X,\] the X is [MP PMT 2000]
  A)
                  \[_{2}^{4}He\] done clear
  B)
                  \[_{3}^{6}Li\] done clear
  C)
                  \[_{3}^{7}Li\]     done clear
  D)
                  \[_{4}^{8}Be\] done clear
  View Solution play_arrow

• question_answer60)
  Which of the following does not contain number of neutrons equal to that of  \[_{18}^{40}Ar\] [MP PMT 2000]
  A)
                  \[_{19}^{41}K\] done clear
  B)
                  \[_{21}^{43}Sc\] done clear
  C)
                  \[_{21}^{40}Sc\]               done clear
  D)
                  \[_{20}^{42}Ca\] done clear
  View Solution play_arrow

• question_answer61)
  Nuclear reactivity of Na and \[N{{a}^{+}}\] is same because  both have                 [Pb. PMT 2000]
  A)
                  Same electron and proton done clear
  B)
                  Same proton and same neutron done clear
  C)
                  Different electron and proton done clear
  D)
                  Different proton and neutron done clear
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• question_answer62)
  Which of the following is the heaviest metal  [MH CET 2001]
  A)
                  Hg          done clear
  B)
                  Pb done clear
  C)
                  Ra           done clear
  D)
                  U done clear
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• question_answer63)
  In the following reaction, \[x\]  will be \[_{29}C{{u}^{64}}{{\to }_{28}}N{{i}^{64}}+x\]
  A)
                  A proton              done clear
  B)
                  An electron done clear
  C)
                  A neutron           done clear
  D)
                  A positron done clear
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• question_answer64)
  Which one out of the following statements is not correct for ortho and para hydrogen     [Orissa JEE 2002]
  A)
                  They have different boiling point done clear
  B)
                  Ortho form is more stable than para form done clear
  C)
                  They differ in the spin of their protons done clear
  D)
                  The ratio of ortho to para hydrogen increases with increase in temperature and finally pure ortho form is obtained done clear
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• question_answer65)
  For the nuclear reaction, \[_{12}^{24}Mg+{{\,}_{1}}{{D}^{2}}\to \alpha +?\], the missing nucleide is                     [Kurukshetra CEE 2002]
  A)
                  \[_{11}^{22}Na\]              done clear
  B)
                  \[_{11}^{23}Na\] done clear
  C)
                  \[_{12}^{23}Mg\]             done clear
  D)
                  \[_{12}^{26}Mg\] done clear
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• question_answer66)
  \[_{Z}{{X}^{M}}{{+}_{2}}H{{e}^{4}}{{\to }_{15}}{{P}^{30}}{{+}_{0}}{{n}^{1}}\]. Then          [KCET 2002]
  A)
                  \[Z=12,\,\,M=27\]           done clear
  B)
                  \[Z=13,\,\,M=27\] done clear
  C)
                  \[Z=12,\,\,M=17\]           done clear
  D)
                  \[Z=13,\,\,M=28\] done clear
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• question_answer67)
  An element \[_{96}{{X}^{227}}\] emits \[4\alpha \] and \[5\beta \] particles to form new element Y. Then atomic number and mass number of Y are                                           [MH CET 2002]
  A)
                  93; 211 done clear
  B)
                  211; 93 done clear
  C)
                  212; 88  done clear
  D)
                  88; 211 done clear
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• question_answer68)
  Meson was discovered                                 [MH CET 2004]
  A)
                  Yukawa                done clear
  B)
                  Austin done clear
  C)
                  Moseley              done clear
  D)
                  Einstein done clear
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