UPSC Chemistry Nuclear Chemistry / नाभिकीय रसायन Question Bank

done Atoms, Molecules and Nuclear Chemistry Total Questions - 40

• question_answer1)
  1 u or 1 amu means
  A)
  1/12th mass of C-12 atoms done clear
  B)
  Mass of C-12 atom done clear
  C)
  Mass of O-16 atom done clear
  D)
  Mass of Hydrogen molecule done clear
  View Solution play_arrow

• question_answer2)
        Which is the symbol of the element tungsten?                       [NDA]
  A)
  Ta done clear
  B)
         Tc done clear
  C)
  W              done clear
  D)
         V done clear
  View Solution play_arrow

• question_answer3)
        What is the mass (in grams) of 3 moles of N?
  A)
  14                done clear
  B)
         28 done clear
  C)
  42               done clear
  D)
         56 done clear
  View Solution play_arrow

• question_answer4)
        The number of molecules in one mole of a gas is
  A)
  \[6.023\times {{10}^{23}}\]     done clear
  B)
         \[6.023\times {{10}^{22}}\] done clear
  C)
  \[6.023\times {{10}^{21}}\]     done clear
  D)
         \[6.023\times {{10}^{20}}\] done clear
  View Solution play_arrow

• question_answer5)
        Valency of Cr in \[CrP{{O}_{4}}\] is
  A)
  4                 done clear
  B)
         3 done clear
  C)
  2                 done clear
  D)
         1 done clear
  View Solution play_arrow

• question_answer6)
        Which of the following are the constituents of matter?

  A. Atoms

  B. Molecules

  C. Solid

  A)
  A and B only     done clear
  B)
         A and C only done clear
  C)
  B and C only     done clear
  D)
         A, B and C done clear
  View Solution play_arrow

• question_answer7)
  The number value \[6.022\text{ }\times \text{1}{{\text{0}}^{23}}\] is also called
  A)
  Dalton Number done clear
  B)
  Avagadro's number done clear
  C)
  Atomic Number done clear
  D)
  Mass Number done clear
  View Solution play_arrow

• question_answer8)
        The molecular formula \[{{P}_{2}}{{O}_{5}}\] means that
  A)
  a molecule contains 2 atoms of P and 5 atoms of O done clear
  B)
  the ratio of the mass of P to the mass of O in the Molecules is 2:5 done clear
  C)
  there are twice as many P atoms in the molecule as there are O atoms done clear
  D)
  the ratio of the mass of P to the mass of 0 in the molecule is 5 : 2 done clear
  View Solution play_arrow

• question_answer9)
        What mass of hydrogen and oxygen will be produced on complete electrolysis of 18g of water?
  A)
  2g hydrogen and 32g oxygen done clear
  B)
  2g hydrogen and 16g oxygen done clear
  C)
  4g hydrogen and 32g oxygen done clear
  D)
  4g hydrogen and 14g oxygen done clear
  View Solution play_arrow

• question_answer10)
  Which of the following statements is /are correct? According to Dalton's theory

  A. An atom is the smallest particle of matter

  B. An atom is the smallest particle of an element

  C. An atom is the smallest indivisible particle of an element that can take part in a chemical change

  D. An atom is the radioactive emission

           
  A)
  A, B, and C done clear
  B)
  B, C and D done clear
  C)
  A, C and D        done clear
  D)
  A and D done clear
  View Solution play_arrow

• question_answer11)
        Which one among the following statements about an atom is not correct?                      [CDS]
  A)
  Atoms always combine to form molecules done clear
  B)
  Atoms are the basic units from which molecules and ions are formed done clear
  C)
  Atoms are always neutral in nature done clear
  D)
  Atoms aggregate in large numbers to form the matter that we can see, feel and touch done clear
  View Solution play_arrow

• question_answer12)
        Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]?                        [CDS]
  A)
  They are isomers of each other done clear
  B)
  They are isotopes of each other                      done clear
  C)
  They are isoelectronic with each other done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer13)
  Which of the following pairs is/are correctly matched? [NDA]

  1. Isotopes: Atoms with same atomic number but different atomic mass

  2. Isobars: Atoms with same number of neutrons but different atomic number

  3 Isotones: Atoms with same mass number but different atomic number

  Select the correct answer using the code given below:

  Code:
  A)
  1, 2 and 3           done clear
  B)
  1 only done clear
  C)
  1 and 2 only        done clear
  D)
  2 only done clear
  View Solution play_arrow

• question_answer14)
        The nucleus of a singly ionized carbon atom contains                      [NDA]
  A)
  6 protons and 6 neutrons done clear
  B)
  5 protons and 6 neutrons done clear
  C)
  6 protons, 6 neutrons and 6 electrons done clear
  D)
  12 protons, 6 neutrons and 6 electrons done clear
  View Solution play_arrow

• question_answer15)
        The following questions consist of two statements, one labelled as the Assertion [A] and the other as Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:                         [NDA]

  Assertion [A]: Atomic weights of most of the elements are not whole numbers.

  Reason (R): Atoms of most of the elements contain mixture of isotopes having different atomic weights.

                                                       
  A)
  Both A and R are individually true and R is the correct explanation of A done clear
  B)
  Both A and R are individually true but R is NOT the correct explanation of A done clear
  C)
  A is true but R is false done clear
  D)
  A is false but R is true done clear
  View Solution play_arrow

• question_answer16)
        An oxide of nitrogen has molecular weight 30. What is the number of electrons in one molecule of the compound?                       [NDA]
  A)
  14                   done clear
  B)
         15 done clear
  C)
  22              done clear
  D)
         23 done clear
  View Solution play_arrow

• question_answer17)
        What is the weight of one atom of Hydrogen in grams?                             [NDA]
  A)
  \[6.023\text{ }\times \text{1}{{\text{0}}^{-23}}\]         done clear
  B)
         \[1.66\text{ }\times \text{1}{{\text{0}}^{-24}}\] done clear
  C)
  \[6.62\text{ }\times \text{1}{{\text{0}}^{-24}}\]              done clear
  D)
         None of these  done clear
  View Solution play_arrow

• question_answer18)
        The atomic weights are expressed in terms of atomic mass unit. Which one of the following is used as a standard?                        [NDA]
  A)
  \[^{1}{{H}_{1}}\]                  done clear
  B)
  \[^{12}{{C}_{6}}\] done clear
  C)
  \[^{16}{{O}_{8}}\]                done clear
  D)
         \[^{35}C{{I}_{17}}\] done clear
  View Solution play_arrow

• question_answer19)
        What is the number of water molecules present in a tiny drop of water (volume 0.0018 ml) at room temperature?                         [NDA]
  A)
  \[4.84\times {{10}^{17}}\]          done clear
  B)
         \[4.184\times {{10}^{18}}\] done clear
  C)
  \[6.023\times {{10}^{19}}\] done clear
  D)
         \[6.023\times {{10}^{23}}\] done clear
  View Solution play_arrow

• question_answer20)
        The number of neutrons in \[_{7}A{{I}^{27}}\] is                       [NDA]
  A)
  40                         done clear
  B)
         27 done clear
  C)
  14              done clear
  D)
         13 done clear
  View Solution play_arrow

• question_answer21)
        The nucleus of a singly ionized carbon atom contains                      [NDA]
  A)
  6 protons and 6 neutrons done clear
  B)
  5 protons and 6 neutrons done clear
  C)
  6 protons, 6 neutrons and 6 electrons done clear
  D)
  12 protons, 6 neutrons and 6 electrons done clear
  View Solution play_arrow

• question_answer22)
        An atom of carbon has 6 protons. Its mass number is 12. How many neutrons are present in an atom of carbon?                        [NDA]
  A)
  12                    done clear
  B)
                   6 done clear
  C)
  10                    done clear
  D)
                   14 done clear
  View Solution play_arrow

• question_answer23)
        What is the number of mole(s) of \[{{H}_{2}}\](g) required to saturate one mole benzene?                          [NDA]
  A)
  1                     done clear
  B)
                   2 done clear
  C)
  3                done clear
  D)
         4 done clear
  View Solution play_arrow

• question_answer24)
        How many moles of hydrogen atom are present in one mole of Aluminium hydroxide?                       [NDA]
  A)
  One mole            done clear
  B)
        Two moles done clear
  C)
  Three moles        done clear
  D)
         Four moles done clear
  View Solution play_arrow

• question_answer25)
  Protons and neutrons are bound in a nucleus by the [NDA]
  A)
  short range 'weak interaction' done clear
  B)
  short range 'strong interaction' done clear
  C)
  long range 'electromagnetic interaction' done clear
  D)
  long range 'gravitational interaction' done clear
  View Solution play_arrow

• question_answer26)
        Which one among the following most correctly determines the atomic number of an element                         [NDA]
  A)
  Number of protons done clear
  B)
  Number of protons and electrons done clear
  C)
  Number of ions done clear
  D)
  Number of nucleons done clear
  View Solution play_arrow

• question_answer27)
        The number of protons in a negatively charged atom (anion) is                           [NDA]
  A)
  more than the atomic number of the element done clear
  B)
  less than the atomic number of the element done clear
  C)
  more than the number of electrons in the atom done clear
  D)
  less than the number of electrons in the atom done clear
  View Solution play_arrow

• question_answer28)
        Which one among the following is correct regarding \[{}^{20}Ne,{}^{23}N{{a}^{+}},{}^{19}{{F}^{-}}and\,\,{}^{24}M{{g}^{2+}}\]?                        [NDA]
  A)
  They are isomers of each other done clear
  B)
  They are isotopes of each other done clear
  C)
  They are isoelectronic with each other done clear
  D)
  All of the above done clear
  View Solution play_arrow

• question_answer29)
  Which of the following pairs is/are correctly matched? [NDA]

  1. Isotopes: Atoms with same atomic number but different atomic mass

  2. Isobars: Atoms with same number of neutrons but different atomic number

  3. Isotones: Atoms with same mass number but different atomic number.

  Select the correct answer using the code given below:

  Code:
  A)
  1, 2 and 3           done clear
  B)
  1 only done clear
  C)
  1 and 2 only done clear
  D)
  2 only done clear
  View Solution play_arrow

• question_answer30)
        Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?                     [NDA]
  A)
  n = 2 to n = 1    done clear
  B)
        n = 3 to n = 2 done clear
  C)
  n = 4 to n = 3    done clear
  D)
        n = 5 to n = 4 done clear
  View Solution play_arrow

• question_answer31)
  Match List I with List II and select the correct answer using the code given below the Lists : [NDA]

  	List I (Scientist)		List II (Discovery)
  A.	Goldstein	1.	Atomic theory
  B.	Chadwick	2.	Proton
  C.	J.J Thomson	3.	Neutron
  D.	John Dalton	4.	Electron

  A)
  A-2,   B-3,   C-4,   D-1 done clear
  B)
  A-2,   B-4,   C-3,   D-1 done clear
  C)
  A-1,   B-4,   C-3,   D-2 done clear
  D)
  A-1,   B-3,   C-4,   D-2 done clear
  View Solution play_arrow

• question_answer32)
        Which formula gives the maximum number of electrons in a shell?
  A)
  \[{{n}^{2}}\]                 done clear
  B)
         \[2{{n}^{2}}\] done clear
  C)
  \[3{{n}^{2}}\]              done clear
  D)
         \[4{{n}^{2}}\] done clear
  View Solution play_arrow

• question_answer33)
        In which one of the following is the valence electronic configuration, \[n{{s}^{2}}n{{p}^{3}}\] found?                         [NDA]
  A)
  Carbon                            done clear
  B)
  Oxygen done clear
  C)
  Nitrogen    done clear
  D)
                   Argon done clear
  View Solution play_arrow

• question_answer34)
        Which of the following isotopes of carbon is/are used in carbon dating?                          [CDS]
  A)
  \[_{6}{{C}^{12}}\] only           done clear
  B)
                   \[_{6}{{C}^{13}}\] only done clear
  C)
  \[_{6}{{C}^{14}}\] only   done clear
  D)
                   \[_{6}{{C}^{12}}\] and \[_{6}{{C}^{14}}\] done clear
  View Solution play_arrow

• question_answer35)
        An \[\alpha \]-particle consists of which of the following?                           [CDS]
  A)
  2 protons and 2 neutrons done clear
  B)
  1 proton and 1 electron done clear
  C)
  2 protons and 4 neutrons done clear
  D)
  1 proton and 1 neutron done clear
  View Solution play_arrow

• question_answer36)
        Which one of the following is heavy water used in nuclear reactor?                      [CDS]
  A)
  Water having molecular weight 18 u done clear
  B)
  Water having molecular weight 20 u done clear
  C)
  Water at \[4{}^\circ C\] but having molecular weight 19u done clear
  D)
  Water below the ice in a frozen sea done clear
  View Solution play_arrow

• question_answer37)
        Which one of the following is not needed in a nuclear fission reactor?                             [CDS]
  A)
  Moderator         done clear
  B)
                   Coolant done clear
  C)
  Accelerator done clear
  D)
                   Control device done clear
  View Solution play_arrow

• question_answer38)
        Heavy water implies                   [CDS]
  A)
  water which is used in heavy industries such as thermal power plants done clear
  B)
  water which contains \[S{{O}_{4}}^{2-}\] and \[C{{I}^{-}}\] of calcium and magnesium done clear
  C)
  deuterated water done clear
  D)
  water which has maximum density done clear
  View Solution play_arrow

• question_answer39)
        Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are                        [CDS]
  A)
  C-12 and C-13    done clear
  B)
        C-13 and C-14 done clear
  C)
  C-12 and C-14    done clear
  D)
        C-12 and carbon black done clear
  View Solution play_arrow

• question_answer40)
        Which one of the following reactions is the main cause of the energy radiation from the Sun?                        [CDS]
  A)
  Fusion reaction   done clear
  B)
        Fission reaction done clear
  C)
  Chemical reaction done clear
  D)
         Diffusion reaction done clear
  View Solution play_arrow