JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank

done The mole concept Total Questions - 27

• question_answer1)
  Which one of the following pairs of gases contains the same number of molecules                                     [EAMCET 1987]
  A)
                  16 g of \[{{O}_{2}}\]and 14 g of \[{{N}_{2}}\]              done clear
  B)
                  8 g of \[{{O}_{2}}\]and 22 g of \[C{{O}_{2}}\] done clear
  C)
                  28 g of \[{{N}_{2}}\]and 22 g of \[C{{O}_{2}}\]            done clear
  D)
                  32 g of \[{{O}_{2}}\]and 32 g of \[{{N}_{2}}\] done clear
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• question_answer2)
  Number of gm of oxygen in 32.2 g \[N{{a}_{2}}S{{O}_{4}}.10{{H}_{2}}O\]is [Haryana PMT 2000]
  A)
                  20.8        done clear
  B)
                  22.4 done clear
  C)
                  2.24        done clear
  D)
                  2.08 done clear
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• question_answer3)
  250 ml of a sodium carbonate solution contains 2.65 grams of \[N{{a}_{2}}C{{O}_{3}}\]. If 10 ml of this solution is diluted to one litre, what is the concentration of the resultant solution (mol. wt. of \[N{{a}_{2}}C{{O}_{3}}\]=106)                                        [EAMCET 2001]
  A)
                  0.1 M      done clear
  B)
                  0.001 M done clear
  C)
                  0.01 M    done clear
  D)
                  \[{{10}^{-4}}\,\]M done clear
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• question_answer4)
  A molar solution is one that contains one mole of a solute in [IIT 1986]
  A)
                  1000 g of the solvent            done clear
  B)
                  One litre of the solvent         done clear
  C)
                  One litre of the solution        done clear
  D)
                  22.4 litres of the solution done clear
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• question_answer5)
  The number of oxygen atoms in 4.4 g of \[C{{O}_{2}}\]is approx.              [CBSE PMT 1990]
  A)
                  \[1.2\times {{10}^{23}}\] done clear
  B)
                  \[6\times {{10}^{22}}\] done clear
  C)
                  \[6\times {{10}^{23}}\]     done clear
  D)
                  \[12\times {{10}^{23}}\] done clear
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• question_answer6)
  The volume occupied by 4.4 g of \[C{{O}_{2}}\]at STP is [AFMC 1997, 2004; Pb. CET 1997, 2002]
  A)
                  22.4 L     done clear
  B)
                  2.24 L done clear
  C)
                  0.224 L done clear
  D)
                  0.1 L done clear
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• question_answer7)
  The number of water molecules present in a drop of water (volume 0.0018 ml) at room temperature is [DCE 2000]
  A)
                  \[6.023\times {{10}^{19}}\]             done clear
  B)
                  \[1.084\times {{10}^{18}}\] done clear
  C)
                  \[4.84\times {{10}^{17}}\]               done clear
  D)
                  \[6.023\times {{10}^{23}}\] done clear
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• question_answer8)
  One mole of calcium phosphide on reaction with excess of water gives                                        [IIT 1999]
  A)
                  One mole of phosphine                       done clear
  B)
                  Two moles of phosphoric acid            done clear
  C)
                  Two moles of phosphine                     done clear
  D)
                  One mole of phosphorus pentoxide done clear
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• question_answer9)
  19.7 kg of gold was recovered from a smuggler. How many atoms of gold were recovered (Au =197)   [Pb. CET 1985]
  A)
                  100         done clear
  B)
                  \[6.02\times {{10}^{23}}\] done clear
  C)
                  \[6.02\times {{10}^{24}}\]               done clear
  D)
                  \[6.02\times {{10}^{25}}\] done clear
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• question_answer10)
  The total number of protons in 10 g of calcium carbonate is (\[{{N}_{0}}=6.023\times {{10}^{23}}\])
  A)
                  \[1.5057\times {{10}^{24}}\]          done clear
  B)
                  \[2.0478\times {{10}^{24}}\] done clear
  C)
                  \[3.0115\times {{10}^{24}}\]          done clear
  D)
                  \[4.0956\times {{10}^{24}}\] done clear
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• question_answer11)
  The number of molecules in 16 g of methane is
  A)
                  \[3.0\times {{10}^{23}}\] done clear
  B)
                  \[6.02\times {{10}^{23}}\] done clear
  C)
                  \[\frac{16}{6.02}\times {{10}^{23}}\]           done clear
  D)
                  \[\frac{16}{3.0}\times {{10}^{23}}\] done clear
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• question_answer12)
  Number of molecules in 100 ml of each of \[{{O}_{2}},\,N{{H}_{3}}\text{ and}\,C{{O}_{2}}\]at STP are                         [Bihar MADT 1985]
  A)
                  In the order \[C{{O}_{2}}<{{O}_{2}}<N{{H}_{3}}\] done clear
  B)
                  In the order \[N{{H}_{3}}<{{O}_{2}}<C{{O}_{2}}\] done clear
  C)
                  The same               done clear
  D)
                  \[N{{H}_{3}}=C{{O}_{2}}<{{O}_{2}}\] done clear
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• question_answer13)
  The molecular weight of hydrogen peroxide is 34. What is the unit of molecular weight            [MP PMT 1986]
  A)
                  \[g\]         done clear
  B)
                  \[mol\] done clear
  C)
                  \[g\,mo{{l}^{-1}}\]             done clear
  D)
                  \[mol\,{{g}^{-1}}\] done clear
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• question_answer14)
  The number of water molecules in 1 litre of water is [EAMCET 1990]
  A)
                  18           done clear
  B)
                  \[18\times 1000\] done clear
  C)
                  \[{{N}_{A}}\]        done clear
  D)
                  \[55.55\,{{N}_{A}}\] done clear
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• question_answer15)
  The number of electrons in a mole of hydrogen molecule is           [CPMT 1987]
  A)
                  \[6.02\times {{10}^{23}}\]               done clear
  B)
                  \[12.046\times {{10}^{23}}\] done clear
  C)
                  \[3.0115\times {{10}^{23}}\]          done clear
  D)
                  Indefinite done clear
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• question_answer16)
  The numbers of moles of \[BaC{{O}_{3}}\]which contain 1.5 moles of oxygen atoms is                                          [EAMCET 1991]
  A)
                  0.5          done clear
  B)
                  1 done clear
  C)
                  3              done clear
  D)
                  \[6.02\times {{10}^{23}}\] done clear
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• question_answer17)
  Which of the following is Loschmidt number
  A)
                  \[6\times {{10}^{23}}\]     done clear
  B)
                  \[2.69\times {{10}^{19}}\] done clear
  C)
                  \[3\times {{10}^{23}}\]     done clear
  D)
                  None of these done clear
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• question_answer18)
  How many molecules are present in one gram of hydrogen [AIIMS 1982]
  A)
                  \[6.02\times {{10}^{23}}\]               done clear
  B)
                  \[3.01\times {{10}^{23}}\] done clear
  C)
                  \[2.5\times {{10}^{23}}\] done clear
  D)
                  \[1.5\times {{10}^{23}}\] done clear
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• question_answer19)
  The total number of gm-molecules of \[S{{O}_{2}}C{{l}_{2}}\] in \[13.5g\] of sulphuryl chloride is                                     [CPMT 1992]
  A)
                  0.1          done clear
  B)
                  0.2 done clear
  C)
                  0.3          done clear
  D)
                  0.4 done clear
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• question_answer20)
  The largest number of molecules is in                [BHU 1997]
  A)
                  \[34g\] of water      done clear
  B)
                  \[28g\] of \[C{{O}_{2}}\] done clear
  C)
                  \[46g\] of \[C{{H}_{3}}OH\]               done clear
  D)
                  \[54g\] of \[{{N}_{2}}{{O}_{5}}\] done clear
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• question_answer21)
  The number of moles of sodium oxide in \[620g\] of it is  [BHU 1992]
  A)
                  1 mol      done clear
  B)
                  10 moles done clear
  C)
                  18 moles                done clear
  D)
                  100 moles done clear
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• question_answer22)
  \[2g\] of oxygen contains number of atoms equal to that in [BHU 1992]
  A)
                  \[0.5g\] of hydrogen              done clear
  B)
                  \[4g\] of sulphur done clear
  C)
                  \[7g\] of nitrogen   done clear
  D)
                  \[2.3g\] of sodium done clear
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• question_answer23)
  Molarity of liquid \[HCl\] with density equal to \[1.17g/cc\] is  [CBSE PMT 2001]
  A)
                  36.5        done clear
  B)
                  18.25 done clear
  C)
                  32.05      done clear
  D)
                  4.65 done clear
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• question_answer24)
  How many atoms are contained in one mole of sucrose \[({{C}_{12}}{{H}_{22}}{{O}_{11}})\]                                        [Pb. PMT 2002]
  A)
                  \[45\times 6.02\times {{10}^{23}}\] atoms/mole          done clear
  B)
                  \[5\times 6.62\times {{10}^{23}}\] atoms/mole done clear
  C)
                  \[5\times 6.02\times {{10}^{23}}\] atoms/mole             done clear
  D)
                  None of these done clear
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• question_answer25)
  The number of molecules of CO2 present in 44g of CO2 is [BCECE 2005]
  A)
                  \[6.0\times {{10}^{23}}\] done clear
  B)
                  \[3\times {{10}^{23}}\] done clear
  C)
                  \[12\times {{10}^{23}}\]  done clear
  D)
                  \[3\times {{10}^{10}}\] done clear
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• question_answer26)
  A sample of phosphorus trichloride \[(PC{{l}_{3}})\] contains 1.4 moles of the substance. How many atoms are there in the sample [Kerala PMT 2004]
  A)
                  4              done clear
  B)
                  5.6 done clear
  C)
                  \[8.431\times {{10}^{23}}\]             done clear
  D)
                  \[3.372\times {{10}^{24}}\] done clear
  E)
                  \[2.409\times {{10}^{24}}\] done clear
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• question_answer27)
  The number of sodium atoms in 2 moles of sodium ferrocyanide is              [BHU 2004]
  A)
                  \[12\times {{10}^{23}}\]  done clear
  B)
                  \[26\times {{10}^{23}}\] done clear
  C)
                  \[34\times {{10}^{23}}\]  done clear
  D)
                  \[48\times {{10}^{23}}\] done clear
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