9th Class Science Atoms and Molecules Question Bank

done Atoms and Molecules Total Questions - 40

• question_answer1)
  According to the Dalton's atomic theory all matter is made of tiny particles called ________.
  A)
  Molecules                       done clear
  B)
  Moles done clear
  C)
  Atoms   done clear
  D)
         Elements done clear
  E)
  None of these done clear
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• question_answer2)
  Which of the following is incorrect statement for the atoms?
  A)
  Nucleus of an atom is made up of protons and neutrons. done clear
  B)
  Atoms are made up of electrons, protons and neutrons. done clear
  C)
  Atoms are very tiny particles. done clear
  D)
  Atoms of different elements have same chemical properties. done clear
  E)
  None of these done clear
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• question_answer3)
  Calculate the number of moles for the 84 g of He.
  A)
  42                                 done clear
  B)
  21 done clear
  C)
  84                     done clear
  D)
         24 done clear
  E)
  None of these done clear
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• question_answer4)
  What is the full form of IUPAC?
  A)
  International Union of Pure and Applied Chemistry done clear
  B)
  International Union Power of Applied Chemistry done clear
  C)
  Internal Union of Pure Applied Chemistry done clear
  D)
  International Universal Pure and Applied Chemistry done clear
  E)
  None of these done clear
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• question_answer5)
  Which of the following is a compound?
  A)
  Sulphur             done clear
  B)
  Ammonia done clear
  C)
  Iron                   done clear
  D)
         Carbon done clear
  E)
  None of these done clear
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• question_answer6)
  Which of the following is the chemical formula of sodium chloride?
  A)
  \[C{{l}_{2}}\]                           done clear
  B)
  \[NaCl\] done clear
  C)
  \[FeCl\]  done clear
  D)
                     \[CaCl\] done clear
  E)
  None of these done clear
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• question_answer7)
  Chlorine is a ­­­­­­­­­­________ element.
  A)
  Monoatomic                   done clear
  B)
  Diatomic done clear
  C)
  Tetra-atomic      done clear
  D)
         Polyatomic done clear
  E)
  None of these done clear
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• question_answer8)
  What is the atomic mass of oxygen?
  A)
  8                                  done clear
  B)
  16 done clear
  C)
  32                     done clear
  D)
         64 done clear
  E)
  None of these done clear
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• question_answer9)
  What is the molecular mass of\[{{H}_{2}}S{{O}_{4}}\] ?
  A)
  64                                 done clear
  B)
  98 done clear
  C)
  36                     done clear
  D)
         56 done clear
  E)
  None of these done clear
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• question_answer10)
  Which one of the following is correct about elements?
  A)
  Elements are consists of one type of atoms. done clear
  B)
  Elements are smallest part of a substance. done clear
  C)
  All the elements are consists of same type of atoms. done clear
  D)
  All the above done clear
  E)
  None of these done clear
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• question_answer11)
  Maximum number of electrons present in a shell is given by the formula______.
  A)
  \[2n\]                             done clear
  B)
  \[{{n}^{2}}\] done clear
  C)
  \[{{n}^{3}}\]               done clear
  D)
         \[2{{n}^{2}}\] done clear
  E)
  None of these done clear
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• question_answer12)
  Which of the following shells can hold maximum number of electrons?
  A)
  M                                 done clear
  B)
  N done clear
  C)
  L                      done clear
  D)
         K done clear
  E)
  None of these done clear
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• question_answer13)
  Select the relation between atomic number, mass number and number of neutrons.
  A)
  Mass number = atomic number + number of neutrons done clear
  B)
  Mass number = atomic number/number of neutrons done clear
  C)
  Mass number =atomic number \[\times \] number of neutrons done clear
  D)
  Mass number = atomic number - number of neutrons done clear
  E)
  None of these done clear
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• question_answer14)
  Which one of the following fundamental particles is negatively charged?
  A)
  Electron done clear
  B)
  Proton done clear
  C)
  Neutron done clear
  D)
         All the above done clear
  E)
  None of these done clear
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• question_answer15)
  An atom contains 6 protons and 8 neutrons. What should be its atomic number?
  A)
  14                                 done clear
  B)
  6 done clear
  C)
  8 done clear
  D)
                                 2 done clear
  E)
  None of these done clear
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• question_answer16)
  An atom contains 14 protons and 16 neutrons. What is its mass number?
  A)
  14                                 done clear
  B)
  16 done clear
  C)
  30                     done clear
  D)
         2 done clear
  E)
  None of these done clear
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• question_answer17)
  Which one of the following statements is correct?

  Statement 1: Nucleus of an atom is negatively charged.

  Statement 2: Nucleus of an atom consists of protons and neutrons.

  A)
  Statement 1 only done clear
  B)
  Statement 2 only done clear
  C)
  Both statements are correct done clear
  D)
  Both statements are incorrect done clear
  E)
  None of these done clear
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• question_answer18)
  The first energy level or shell is represented by which one of the following letter?
  A)
  K                      done clear
  B)
  L done clear
  C)
  M                     done clear
  D)
         N done clear
  E)
  None of these done clear
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• question_answer19)
  What is the maximum number of electrons that can be accommodated in the second shell?
  A)
  2                                  done clear
  B)
  8 done clear
  C)
  18                     done clear
  D)
         26 done clear
  E)
  None of these done clear
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• question_answer20)
  Cathode rays are:
  A)
  Negatively charged          done clear
  B)
  Positively charged done clear
  C)
  Neutral  done clear
  D)
         All above done clear
  E)
  None of these done clear
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• question_answer21)
  16 g of water is equal to ____ moles.
  A)
  1.2                                done clear
  B)
  1.9 mol done clear
  C)
  0.8                    done clear
  D)
         8.8 mol done clear
  E)
  None of these done clear
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• question_answer22)
  Which one of the following was not explained in Rutherford's nuclear model of atom?
  A)
  An atom consists of tiny positively charged nucleus surrounded by negatively charged electrons. done clear
  B)
  Stability of an atom. done clear
  C)
  Most of the mass of atom is concentrated in the nucleus. done clear
  D)
  The number of electrons and protons are equal in an atom. done clear
  E)
  None of these done clear
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• question_answer23)
  The number of electrons present in M shell of chlorine is:
  A)
  8                                  done clear
  B)
  7 done clear
  C)
  2                      done clear
  D)
         18 done clear
  E)
  None of these done clear
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• question_answer24)
  Molar mass of \[{{C}_{2}}{{H}_{4}}\] is:
  A)
  \[26\,g\,mo{{l}^{-1}}\]             done clear
  B)
  \[28\,g\,mo{{l}^{-1}}\] done clear
  C)
  \[30\,g\ mo{{l}^{-1}}\] done clear
  D)
         \[32\,g\,mo{{l}^{-1}}\] done clear
  E)
  None of these done clear
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• question_answer25)
  Calculate the number of sulphur molecules in a 300 g sample of sulphur \[[{{S}_{8}}].\]
  A)
  \[7.7\times {{10}^{20}}\,molecules\] done clear
  B)
  \[7.05\times {{10}^{23}}\,molecules\] done clear
  C)
  \[5.07\times {{10}^{23}}molecules\] done clear
  D)
  \[6.023\times {{10}^{23}}\,molecules\] done clear
  E)
  None of these done clear
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• question_answer26)
  Symbol of nucleus with atomic number 18 and mass number 40 is written as:
  A)
  \[_{18}^{40}R\]                       done clear
  B)
  \[_{18}^{40}Ar\] done clear
  C)
  \[_{40}^{18}Ar\]          done clear
  D)
         40 Ar 18 done clear
  E)
  None of these done clear
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• question_answer27)
  The mass of \[3.0115\times {{10}^{23}}\] molecules of chlorine is:
  A)
  35.5 g   done clear
  B)
  7 g done clear
  C)
  78 g                  done clear
  D)
         40 g done clear
  E)
  None of these done clear
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• question_answer28)
  Number of atoms in 69 g of Na is :
  A)
  \[1.0\times {{10}^{24}}\] atoms of Na done clear
  B)
  \[1.80\times {{10}^{24}}\] atoms of Na done clear
  C)
  \[6.023\times {{10}^{24}}\] atoms of Na done clear
  D)
  \[1.5\times {{10}^{23}}\] atoms of Na done clear
  E)
  None of these done clear
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• question_answer29)
  The term ?mole? in chemistry was introduced by who of the following.
  A)
  Lavosier            done clear
  B)
  Wilhelm Ostwald done clear
  C)
  John Dalton       done clear
  D)
         Neil Bohr done clear
  E)
  None of these done clear
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• question_answer30)
  The percentage of sulphur in sulphuric acid is :
  A)
  40%                              done clear
  B)
  32.6% done clear
  C)
  42%                  done clear
  D)
         35% done clear
  E)
  None of these done clear
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• question_answer31)
  The number of atoms of oxygen present in 24 g of oxygen gas is:
  A)
  \[5.2\times {{10}^{23}}\] atoms            done clear
  B)
  \[9.03\times {{10}^{23}}\]atoms done clear
  C)
  \[5.8\times {{10}^{24}}\] atoms            done clear
  D)
  \[9.4\times {{10}^{24}}\]atoms done clear
  E)
  None of these done clear
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• question_answer32)
  The ratio of C : O by mass in \[C{{O}_{2}}\]is:
  A)
  8 : 3                              done clear
  B)
  3 : 8 done clear
  C)
  1 : 16    done clear
  D)
         16 : 1 done clear
  E)
  None of these done clear
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• question_answer33)
  Which one of the following is a triatomic molecule?
  A)
  \[N{{H}_{3}}\] done clear
  B)
         \[C{{H}_{4}}\] done clear
  C)
  \[{{N}_{2}}\]                done clear
  D)
         \[N{{O}_{2}}\] done clear
  E)
  None of these done clear
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• question_answer34)
  Quicklime contains:
  A)
  Sodium and hydrogen only done clear
  B)
  Calcium and oxygen done clear
  C)
  Oxygen and hydrogen only done clear
  D)
  Potassium and sulphur done clear
  E)
  None of these done clear
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• question_answer35)
  Calculate the mass of water which contains the same number of molecules as are contained in 60 g of oxygen.
  A)
  60.8 g               done clear
  B)
  30.75 g done clear
  C)
  33.75 g  done clear
  D)
         76.5 g done clear
  E)
  None of these done clear
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• question_answer36)
  Calculate the mass of \[{{H}_{2}}{{O}_{2}}\] contained in \[0.4\] mole of\[{{H}_{2}}{{O}_{2}}\].
  A)
  18.2 g               done clear
  B)
  13.6 g done clear
  C)
  13.4 g   done clear
  D)
         18.4. done clear
  E)
  None of these done clear
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• question_answer37)
  Number of atoms present in \[5g\] of \[NaN{{O}_{3}}\]is:
  A)
  \[1.8\times {{10}^{24}}\] atoms            done clear
  B)
  3.54 atoms done clear
  C)
  \[3.54\times {{10}^{24}}\] atoms          done clear
  D)
  \[1.54\times {{10}^{23}}\] atoms done clear
  E)
  None of these done clear
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• question_answer38)
  The isotopes contain the same number of____ and different number of______.
  A)
  Neutrons, Protons           done clear
  B)
  Electrons, Protons done clear
  C)
  Protons, Neutrons           done clear
  D)
  Neutrons, Protons done clear
  E)
  None of these done clear
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• question_answer39)
  Formula of copper (II) sulphate pentahydrate is:
  A)
  \[CuS{{o}_{4}}.2{{H}_{2}}O\]             done clear
  B)
  \[Cu\,S{{o}_{4}}.5{{H}_{2}}O\] done clear
  C)
  \[5Cu\,S{{o}_{4}}.{{H}_{2}}O\] done clear
  D)
         \[Cu\,S{{o}_{4}}.{{H}_{2}}O\] done clear
  E)
  None of these done clear
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• question_answer40)
  Number of valence electrons in sulphur are:
  A)
  8                                  done clear
  B)
  6 done clear
  C)
  2                      done clear
  D)
         7 done clear
  E)
  None of these done clear
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