JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank

done Critical Thinking Total Questions - 24

• question_answer1)
  Which of the following atoms and ions are isoelectronic i.e. have the same number of electrons with the neon atom [NCERT 1978]
  A)
                  \[{{F}^{-}}\]        done clear
  B)
                  Oxygen atom done clear
  C)
                  \[Mg\]  done clear
  D)
                  \[{{N}^{-}}\] done clear
  View Solution play_arrow

• question_answer2)
  Atoms consists of protons, neutrons and electrons. If the mass of neutrons and electrons were made half and two  times  respectively to their actual masses, then the atomic mass of \[_{6}{{C}^{12}}\] [NCERT 1982]
  A)
                  Will remain approximately the same done clear
  B)
                  Will become approximately two  times done clear
  C)
                  Will remain approximately half done clear
  D)
                  Will be reduced by 25% done clear
  View Solution play_arrow

• question_answer3)
  The increasing order (lowest first) for the values of \[e/m\] (charge/mass) for                                   [IIT 1984]
  A)
                  \[e,\,p,\,n,\,\alpha \]     done clear
  B)
                  \[n,\,p,\,e,\,\alpha \] done clear
  C)
                  \[n,\,p,\,\alpha ,e\]        done clear
  D)
                  \[n,\,\alpha ,\,p,\,e\] done clear
  View Solution play_arrow

• question_answer4)
  The electronic configuration of a dipositive metal \[{{M}^{2+}}\] is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be [MNR 1984, 89; Kerala PMT 1999]
  A)
                  30           done clear
  B)
                  32 done clear
  C)
                  34           done clear
  D)
                  42 done clear
  View Solution play_arrow

• question_answer5)
  The ratio of the energy of a photon of \[2000{AA}\] wavelength radiation to that of \[4000{AA}\] radiation is [IIT 1986; DCE 2000; JIPMER 2000]
  A)
  1/4         done clear
  B)
  4 done clear
  C)
  1/2 done clear
  D)
  2 done clear
  View Solution play_arrow

• question_answer6)
  Discovery of the nucleus of an atom was due to the experiment carried out by  [CPMT 1983; MP PET 1983]
  A)
                  Bohr      done clear
  B)
                  Mosley done clear
  C)
                  Rutherford         done clear
  D)
                  Thomson done clear
  View Solution play_arrow

• question_answer7)
  In a Bohr's model of atom when an electron jumps from \[n=1\] to \[n=3\], how much energy will be emitted or absorbed                                                [CBSE PMT 1996]
  A)
                  \[2.15\times {{10}^{-11}}erg\]    done clear
  B)
                  \[0.1911\times {{10}^{-10}}erg\] done clear
  C)
                  \[2.389\times {{10}^{-12}}erg\]                 done clear
  D)
                  \[0.239\times {{10}^{-10}}erg\] done clear
  View Solution play_arrow

• question_answer8)
  The nucleus of an atom can be assumed to be spherical. The radius of the nucleus of mass number \[A\] is given by \[1.25\times {{10}^{-13}}\times {{A}^{1/3}}cm\] Radius of atom is one \[{AA}\]. If the mass number is 64, then the fraction of the atomic volume that is occupied by the nucleus is [NCERT 1983]
  A)
  \[1.0\times {{10}^{-3}}\]               done clear
  B)
  \[5.0\times {{10}^{-5}}\] done clear
  C)
  \[2.5\times {{10}^{-2}}\]               done clear
  D)
  \[1.25\times {{10}^{-13}}\] done clear
  View Solution play_arrow

• question_answer9)
  The energy of an electron in the first Bohr orbit of \[H\]atom is \[-13.6eV\]. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits to hydrogen is(are) [IIT 1998; Orissa JEE 2005]
  A)
                  \[-3.4eV\]           done clear
  B)
                  \[-4.2eV\] done clear
  C)
                  \[-6.8eV\] done clear
  D)
                  \[+6.8eV\] done clear
  View Solution play_arrow

• question_answer10)
  The energy of the electron in the first orbit of \[H{{e}^{+}}\] is \[-871.6\times {{10}^{-20}}J\]. The energy of the electron in the first orbit of hydrogen would be       [Roorkee Qualifying 1998]
  A)
                  \[-871.6\times {{10}^{-20}}J\]     done clear
  B)
                  \[-435.8\times {{10}^{-20}}J\] done clear
  C)
                  \[-217.9\times {{10}^{-20}}J\]     done clear
  D)
                  \[-108.9\times {{10}^{-20}}J\] done clear
  View Solution play_arrow

• question_answer11)
  The total number of valence electrons in \[4.2\,gm\] of \[N_{3}^{-}\]  ion is (\[{{N}_{A}}\] is the Avogadro's number)     [CBSE PMT 1994]
  A)
                  \[1.6{{N}_{A}}\]                done clear
  B)
                  \[3.2{{N}_{A}}\] done clear
  C)
                  \[2.1{{N}_{A}}\]                done clear
  D)
                  \[4.2{{N}_{A}}\]  done clear
  View Solution play_arrow

• question_answer12)
  The Bohr orbit radius for the hydrogen atom \[(n=1)\] is approximately \[0.530{AA}\]. The radius for the first excited state \[(n=2)\] orbit is               [CBSE PMT 1998; BHU 1999]
  A)
  \[0.13{AA}\]     done clear
  B)
  \[1.06{AA}\] done clear
  C)
  \[4.77{AA}\]     done clear
  D)
  \[2.12{AA}\] done clear
  View Solution play_arrow

• question_answer13)
  The frequency of a wave of light is \[12\times {{10}^{14}}{{s}^{-1}}.\] The wave number associated with this light is         [Pb. PMT 1999]
  A)
                  \[5\times {{10}^{-7}}m\]               done clear
  B)
                  \[4\times {{10}^{-8}}c{{m}^{-1}}\] done clear
  C)
                  \[2\times {{10}^{-7}}{{m}^{-1}}\]              done clear
  D)
                  \[4\times {{10}^{4}}c{{m}^{-1}}\] done clear
  View Solution play_arrow

• question_answer14)
  The series limit for Balmer series of H-spectra is                              [AMU (Engg.) 1999]
  A)
                  3800       done clear
  B)
                  4200 done clear
  C)
                  3646       done clear
  D)
                  4000 done clear
  View Solution play_arrow

• question_answer15)
  The ionization energy of hydrogen atom is \[-13.6\,eV.\] The energy required to excite the electron in a hydrogen atom from the ground state to the first excited state is (Avogadro?s constant = 6.022 × 1023)   [BHU 1999]
  A)
                  \[1.69\times {{10}^{-20}}J\]         done clear
  B)
                  \[1.69\times {{10}^{-23}}J\] done clear
  C)
                  \[1.69\times {{10}^{23}}J\]          done clear
  D)
                  \[1.69\times {{10}^{25}}J\] done clear
  View Solution play_arrow

• question_answer16)
  The energy required to dislodge electron from excited isolated H-atom, \[I{{E}_{1}}=13.6\,\,eV\] is         [DCE 2000]
  A)
                  \[=\,13.6\,eV\] done clear
  B)
                  \[>\,13.6\,eV\] done clear
  C)
                  \[<13.6\]and\[>3.4\,eV\]             done clear
  D)
                  \[\le \,3.4\,eV\] done clear
  View Solution play_arrow

• question_answer17)
  The number of nodal planes in a \[{{p}_{x}}\] is [IIT Screening 2000]
  A)
                  One       done clear
  B)
                  Two done clear
  C)
                  Three    done clear
  D)
                  Zero done clear
  View Solution play_arrow

• question_answer18)
  The third line in Balmer series corresponds to an electronic transition between which Bohr?s orbits in hydrogen [MP PMT 2001]
  A)
                  5 ® 3    done clear
  B)
                  5 ® 2 done clear
  C)
                  4 ® 3    done clear
  D)
                  4 ® 2 done clear
  View Solution play_arrow

• question_answer19)
  Which of the following has maximum number of unpaired electron (atomic number of Fe 26)     [MP PMT 2001]
  A)
                  Fe           done clear
  B)
                  Fe (II) done clear
  C)
                  Fe (III)   done clear
  D)
                  Fe (IV) done clear
  View Solution play_arrow

• question_answer20)
  The frequency of one of the lines in Paschen series of hydrogen atom is \[2.340\times {{10}^{11}}Hz.\] The quantum number \[{{n}_{2}}\] which produces this transition is    [DPMT 2001]
  A)
                  6              done clear
  B)
                  5 done clear
  C)
                  4              done clear
  D)
                  3 done clear
  View Solution play_arrow

• question_answer21)
  Which of the following electron transition in a hydrogen atom will require the largest amount of energy                 [UPSEAT 1999, 2000, 01]
  A)
                  From \[n=1\] to \[n=2\]                done clear
  B)
                  From \[n=2\] to \[n=3\] done clear
  C)
                  From \[n=\infty \] to \[n=1\]      done clear
  D)
                  From \[n=3\] to \[n=5\] done clear
  View Solution play_arrow

• question_answer22)
  In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen               [AIEEE 2003]
  A)
                  3 ® 2 done clear
  B)
                  5 ® 2 done clear
  C)
                  4 ® 1    done clear
  D)
                  2 ® 5 done clear
  View Solution play_arrow

• question_answer23)
  The value of Planck?s constant is \[6.63\times {{10}^{-34}}Js.\] The velocity of light is \[3.0\times {{10}^{8}}\,m{{s}^{-1}}\]. Which value is closest to the wavelength in nanometres of a quantum of light with frequency of  \[8\times {{10}^{15}}{{s}^{-1}}\]                                    [CBSE PMT 2003]
  A)
                  \[3\times {{10}^{7}}\]    done clear
  B)
                  \[2\times {{10}^{-25}}\] done clear
  C)
                  \[5\times {{10}^{-18}}\]                done clear
  D)
                  \[4\times {{10}^{1}}\] done clear
  View Solution play_arrow

• question_answer24)
  As electron moves away from the nucleus, its potential energy                                 [UPSEAT 2003]
  A)
                  Increases             done clear
  B)
                  Decreases done clear
  C)
                  Remains constant            done clear
  D)
                  None of these done clear
  View Solution play_arrow