9th Class Science Atoms and Molecules Question Bank

done Atoms and Molecules Total Questions - 50

• question_answer1)
  Identify the symbols of lead and mercury respectively.
  A)
  \[Hg,\,\,Pb\]                   done clear
  B)
  \[Pb,\,\,Hg\]   done clear
  C)
  \[Le,\,\,Mg\]       done clear
  D)
         \[Ld,\,\,My\] done clear
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• question_answer2)
  What is the weight of \[3\] gram atoms of sulphur?
  A)
  \[96\,\,g\]                         done clear
  B)
         \[99\,\,g\] done clear
  C)
  \[100\,\,g\]         done clear
  D)
         \[3\,\,g\] done clear
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• question_answer3)
  How many moles of oxygen atoms are present in one mole of acetic acid?
  A)
   \[1\] mole          done clear
  B)
          \[3\] moles done clear
  C)
   \[2\] moles          done clear
  D)
          \[6\] moles done clear
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• question_answer4)
  Calculate the weight in grams present in \[0.7\] moles of sodium.
  A)
  \[16.1\,\,g\]          done clear
  B)
  \[16.2\,\,g\] done clear
  C)
  \[16.3\,\,g\]        done clear
  D)
         \[0.161\,\,g\] done clear
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• question_answer5)
  How many gram atoms and atoms are there in \[10\] grams of calcium?
  A)
   \[0.25\] gram atoms, \[6.023\times {{10}^{-23}}\] atoms done clear
  B)
   \[0.25\] gram atoms, \[1.50\times {{10}^{-23}}\] atoms   done clear
  C)
   \[0.1\] gram atoms, \[6.023\times {{10}^{23}}\] atoms done clear
  D)
   \[0.1\] gram atoms, \[1.50\times {{10}^{23}}\] atoms done clear
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• question_answer6)
  How many moles are present in \[540\,\,g\] of glucose\[({{C}_{6}}{{H}_{12}}{{O}_{6}})\]?
  A)
   \[2\]moles         done clear
  B)
          \[3\]moles   done clear
  C)
   \[4\]moles         done clear
  D)
          \[1\]mole done clear
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• question_answer7)
  How much lime is obtained by burning \[400\,\,g\] of lime stone?
  A)
  \[224\,\,g\]           done clear
  B)
         \[220\,\,g\] done clear
  C)
  \[400\,\,g\]         done clear
  D)
         \[320\,\,g\] done clear
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• question_answer8)
  The approximate production of sodium carbonate per month is \[424\times {{10}^{6}}g\] while that of methyl alcohol is\[320\times {{10}^{6}}g\]. Which of the following is produced more in terms of number of moles?
  A)
   Sodium carbonate          done clear
  B)
   Methyl alcohol   done clear
  C)
   Both [a] and [b] done clear
  D)
          Data insufficient done clear
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• question_answer9)
  Calculate the weight of \[3.0\] moles of\[KCl{{O}_{3}}\].
  A)
  \[245\,\,g\]         done clear
  B)
         \[249\,\,g\] done clear
  C)
  \[367.5\,\,g\]         done clear
  D)
         \[24.5\,\,g\] done clear
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• question_answer10)
  Identify the correct increasing order of molecular weights of the given compounds.
  A)
   \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\] done clear
  B)
   \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\] done clear
  C)
   \[{{H}_{2}}O<{{H}_{2}}S<C{{O}_{2}}<S{{O}_{2}}\]   done clear
  D)
   \[{{H}_{2}}O>{{H}_{2}}S>C{{O}_{2}}>S{{O}_{2}}\] done clear
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• question_answer11)
  Calculate the number of moles present in \[400\] grams of\[CaC{{O}_{3}}\].
  A)
   \[2\]moles         done clear
  B)
          \[3\]moles done clear
  C)
   \[1\]mole           done clear
  D)
          \[4\]moles   done clear
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• question_answer12)
  Calculate the weight of \[0.885\] moles of\[Mg{{(N{{O}_{3}})}_{2}}\].
  A)
  \[13.1\,\,g\]        done clear
  B)
         \[131\,\,g\]   done clear
  C)
  \[130\,\,g\]         done clear
  D)
         \[88.5\,\,g\] done clear
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• question_answer13)
  What is the mass of one molecule of oxygen?
  A)
  \[5.31\times {{10}^{-23}}g\]       done clear
  B)
         \[5.33\times {{10}^{23}}g\] done clear
  C)
  \[5.25\times {{10}^{23}}g\]      done clear
  D)
         \[5.02\times {{10}^{-23}}g\] done clear
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• question_answer14)
  Calculate the number of atoms present in \[6.4\,\,g\] of sulphur.
  A)
   \[2.4\times {{10}^{-23}}\]atoms done clear
  B)
   \[2.4\times {{10}^{-23}}\]atoms done clear
  C)
   \[1.2\times {{10}^{23}}\]atoms   done clear
  D)
   \[1.2\times {{10}^{-23}}\]atoms done clear
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• question_answer15)
  How many gram atoms are present in \[256\,\,g\] of\[{{O}_{2}}\]?
  A)
   \[16\] gram atoms   done clear
  B)
          \[32\] gram atoms done clear
  C)
   \[14\] gram atoms done clear
  D)
          \[36\] gram atoms done clear
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• question_answer16)
  Calculate the number of atoms present in \[71\,\,g\] of\[C{{l}_{2}}\].
  A)
  \[1.205\times {{10}^{-24}}\]atoms         done clear
  B)
  \[1.205\times {{10}^{23}}\]atoms done clear
  C)
  \[1.205\times {{10}^{24}}\]atoms   done clear
  D)
         \[1.205\times {{10}^{-23}}\]atoms done clear
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• question_answer17)
  What does the atomicity of an element tell us about?
  A)
   Physical properties done clear
  B)
   Number of electrons done clear
  C)
   Number of atoms in one molecule   done clear
  D)
   Its combining capacity done clear
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• question_answer18)
  Calculate the weight in grams of \[0.75\] gram moles of\[NaHC{{O}_{3}}\].
  A)
  \[64\,\,g\]                       done clear
  B)
         \[63\,\,g\]   done clear
  C)
  \[65\,\,g\]                       done clear
  D)
         \[66\,\,g\] done clear
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• question_answer19)
  Calculate the number of moles of helium present in\[6.46\,\,g\]. (The atomic weight of helium is\[4\,\,a.m.u.\]).
  A)
   \[16.15\] moles   done clear
  B)
          \[1.615\] moles   done clear
  C)
   \[161.5\] moles   done clear
  D)
          \[0.1615\] moles done clear
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• question_answer20)
  Calculate the weight of \[2.5\] moles of\[CaC{{O}_{3}}\].
  A)
  \[200\,\,g\]         done clear
  B)
         \[230\,\,g\] done clear
  C)
  \[240\,\,g\]         done clear
  D)
         \[250\,\,g\]   done clear
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• question_answer21)
  How many grams of \[N{{a}_{2}}C{{O}_{3}}\] weighed to get \[0.1\] mole\[N{{a}_{2}}C{{O}_{3}}\]?
  A)
  \[10\,\,g\]                       done clear
  B)
         \[5\,\,g\] done clear
  C)
  \[10.6\,\,g\]          done clear
  D)
         \[12.6\,\,g\] done clear
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• question_answer22)
  A molecular formula is a short form representation of\['X'\]. Identify \['X'\] from the following.
  A)
   A compound   done clear
  B)
          An element done clear
  C)
   A mixture         done clear
  D)
          An alloy done clear
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• question_answer23)
  Calculate the weight of \[0.8\] moles of magnesium.
  A)
   \[20\,\,g\]          done clear
  B)
          \[30\,\,g\]   done clear
  C)
   \[19.2\,\,g\]       done clear
  D)
          \[31.2\,\,g\] done clear
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• question_answer24)
  Calculate the number of molecules present in\[0.5\]moles of magnesium oxide\[(MgO)\]. (Atomic weights\[Mg=24,\,\,O=16\])
  A)
   \[14.09\times {{10}^{23}}\]molecules done clear
  B)
   \[3.0115\times {{10}^{23}}\]molecules   done clear
  C)
   \[30.12\times {{10}^{23}}\]molecules done clear
  D)
   \[14.09\times {{10}^{-23}}\]molecules done clear
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• question_answer25)
  Calculate the number of grams present in \[0.5\] moles of acetylene.
  A)
  \[13\,\,g\]                         done clear
  B)
         \[14\,\,g\] done clear
  C)
  \[16\,\,g\]                       done clear
  D)
         \[13.5\,\,g\] done clear
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• question_answer26)
  Calculate the number of iron atoms in a piece of iron weighing 2.8 g.(Atomic mass of iron\[=56\])
  A)
   \[30.11\times {{10}^{23}}\]atoms done clear
  B)
   \[3.11\times {{10}^{23}}\]atoms done clear
  C)
   \[3.0115\times {{10}^{22}}\]atoms   done clear
  D)
   \[301.1\times {{10}^{23}}\]atoms done clear
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• question_answer27)
  If the formula of chromic acid is \[{{H}_{2}}Cr{{O}_{4}}\], then what is the formula of divalent metal chromate?
  A)
  \[MCr{{O}_{4}}\]            done clear
  B)
         \[{{M}_{2}}Cr{{O}_{4}}\] done clear
  C)
  \[{{M}_{2}}{{(Cr{{O}_{4}})}_{3}}\]    done clear
  D)
         \[{{M}_{3}}Cr{{O}_{4}}\] done clear
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• question_answer28)
  Sulphur molecule exists as\[{{S}_{8}}\]. How many moles of sulphur are present in \[25.6\] grams of sulphur?
  A)
   \[0.01\]moles     done clear
  B)
          \[0.1\]moles   done clear
  C)
   \[0.02\]moles     done clear
  D)
          \[0.2\]moles done clear
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• question_answer29)
  Calculate the number of moles of zinc in\[23.3\,\,g\].
  A)
   \[0.37\]moles     done clear
  B)
          \[0.36\]moles   done clear
  C)
   \[0.5\]moles       done clear
  D)
          \[0.53\]moles done clear
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• question_answer30)
  How many grams of sodium oxalate are to be weighed to get 0.1 mole of sodium oxalate\[(N{{a}_{2}}{{C}_{2}}{{O}_{4}})\]?
  A)
   \[13.4\,\,g\]         done clear
  B)
          \[1.34\,\,g\] done clear
  C)
   \[134\,\,g\]        done clear
  D)
          \[0.134\,\,g\] done clear
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• question_answer31)
  Calculate the number of atoms of sulphur present in \[0.5\] moles of.
  A)
   \[62.02\times {{10}^{23}}\]atoms         done clear
  B)
   \[622\times {{10}^{23}}\]atoms done clear
  C)
   \[6.023\times {{10}^{23}}\]atoms           done clear
  D)
   \[6.02\times {{10}^{-23}}\]atoms done clear
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• question_answer32)
  How many moles are present in \[5.3\,\,g\] of anhydrous sodium carbonate?
  A)
   \[0.03\] moles    done clear
  B)
          \[0.04\] moles done clear
  C)
   \[0.05\] moles      done clear
  D)
          \[0.01\] moles done clear
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• question_answer33)
  Calculate the number of moles present in \[4.9\,\,g\] of\[4.9\,\,g\]of\[{{H}_{2}}S{{O}_{4}}\].
  A)
   \[0.01\] moles    done clear
  B)
          \[0.02\] moles done clear
  C)
   \[0.05\] moles      done clear
  D)
          \[0.03\] moles done clear
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• question_answer34)
  Calculate the number of moles present in \[60\,\,g\] of\[NaOH\].
  A)
   \[1.2\] moles     done clear
  B)
          \[1.5\] moles   done clear
  C)
   \[2.5\] moles        done clear
  D)
          \[0.15\] moles done clear
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• question_answer35)
  What will be the weight of \[0.1\] mole of \[CaC{{O}_{3}}\]in grams?
  A)
  \[11\,\,g\]                       done clear
  B)
         \[12\,\,g\] done clear
  C)
  \[3\,\,g\]             done clear
  D)
         \[10\,\,g\]   done clear
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• question_answer36)
  Calculate the weight of sulphur present in \[1.5\] moles of hydrogen sulphide.
  A)
  \[48\,\,g\]                         done clear
  B)
         \[50\,\,g\] done clear
  C)
  \[60\,\,g\]                       done clear
  D)
         \[70\,\,g\] done clear
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• question_answer37)
  Calculate the mass of one molecule of\[{{H}_{2}}O\].
  A)
  \[29.88\times {{10}^{23}}g\] done clear
  B)
         \[2.988\times {{10}^{23}}g\] done clear
  C)
  \[0.2988\times {{10}^{23}}g\] done clear
  D)
         \[2.988\times {{10}^{-23}}g\]   done clear
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• question_answer38)
  What weight of calcium contains the same number of atoms as those in \[3\text{ }g\] of carbon?
  A)
  \[10\,\,g\]                         done clear
  B)
         \[20\,\,g\] done clear
  C)
  \[30\,\,g\]                       done clear
  D)
         \[40\,\,g\] done clear
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• question_answer39)
  What weight of sodium contains the same number of atoms as those in \[8\] grams of oxygen?
  A)
  \[10.5\,\,g\]        done clear
  B)
         \[13.5\,\,g\] done clear
  C)
  \[11.5\,\,g\]          done clear
  D)
         \[14.2\,\,g\] done clear
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• question_answer40)
  Calculate the number of moles present in \[17\] grams of\[AgN{{O}_{3}}\].
  A)
   \[0.2\] moles      done clear
  B)
          \[0.1\] mole   done clear
  C)
   \[2\] moles       done clear
  D)
          \[1\] mole done clear
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• question_answer41)
  My Identify the pair of substances having the same formula unit mass.
  A)
   Calcium chloride, potassium carbonate done clear
  B)
   Calcium oxide, hydrochloric acid done clear
  C)
   Carbon monoxide, ammonia done clear
  D)
   Carbon dioxide, nitrous oxide   done clear
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• question_answer42)
  Find the number of moles of sodium nitrate which contains 1.5 moles of oxygen atoms.
  A)
  \[0.5\]                              done clear
  B)
  \[1.5\] done clear
  C)
  \[2.0\]                done clear
  D)
         \[1.0\] done clear
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• question_answer43)
  What is the ratio of the number of atoms of elements potassium, chlorine and oxygen respectively present in \[245\,\,g\] of\[KCl{{O}_{3}}\]?
  A)
  \[2:2:3\] done clear
  B)
         \[1:1:3\]   done clear
  C)
  \[39:36:48\]        done clear
  D)
         \[1:2:6\] done clear
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• question_answer44)
  Carbon and oxygen react to produce carbon dioxide. What is the weight of oxygen required to convert \[1.5\,\,g\] of carbon to carbon dioxide?
  A)
  \[2\,\,g\]             done clear
  B)
         \[6\,\,g\] done clear
  C)
  \[1\,\,g\]             done clear
  D)
         \[4\,\,g\]   done clear
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• question_answer45)
  Selenium ingestion of \[90\] micrograms per day causes loss of hair. How many selenium atoms are there in this sample? (Atomic weight of \[Se=78.96\])
  A)
   \[6.8\times {{10}^{23}}\]atoms done clear
  B)
          \[8.8\times {{10}^{17}}\]atoms done clear
  C)
   \[8.8\times {{10}^{22}}\]atoms done clear
  D)
          \[6.9\times {{10}^{17}}\]atoms   done clear
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• question_answer46)
  All samples of pure water contain hydrogen and oxygen in the mass ratio of\[1:8\].To which of the following laws does the above statement is in agreement?
  A)
   Law of conservation of mass done clear
  B)
   Law of constant proportion   done clear
  C)
   Law of multiple proportion done clear
  D)
   Law of definite proportion done clear
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• question_answer47)
  Which of the following element's gram weight is \[6\,\,g\]for \[0.25\] moles of that element?
  A)
   Chlorine            done clear
  B)
          Magnesium   done clear
  C)
   Boron               done clear
  D)
          Carbon done clear
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• question_answer48)
  Which of the following is NOT a divalent ion?
  A)
   Sulphate           done clear
  B)
          Nitrate   done clear
  C)
   Hydrogen phosphate      done clear
  D)
   Carbonate done clear
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• question_answer49)
  How many gram atoms and number of atoms are present in \[20\,\,g\] of calcium?
  A)
   \[0.05\] gram atoms and \[3.1\times {{10}^{23}}\]atoms done clear
  B)
   \[0.5\] gram atoms and \[3.01\times {{10}^{23}}\]atoms   done clear
  C)
   \[0.5\]gram atoms and \[3.1\times {{10}^{23}}\]atoms done clear
  D)
   \[0.2\] gram atoms and \[3.1\times {{10}^{23}}\]atoms done clear
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• question_answer50)
  If the formula of a chloride of a metal\[M\]is\[MC{{l}_{3}}\], then what will be the formula of the phosphate of metal\[M\]?
  A)
  \[MP{{O}_{4}}\]             done clear
  B)
         \[{{M}_{2}}P{{O}_{4}}\] done clear
  C)
  \[{{M}_{3}}P{{O}_{4}}\]         done clear
  D)
         \[{{M}_{2}}{{(P{{O}_{4}})}_{3}}\] done clear
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