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

done Critical Thinking Total Questions - 18

• question_answer1)
  Mixture of sand and sulphur may best be separated by [Kerala CET  2001]
  A)
                  Fractional crystallisation from aqueous solution               done clear
  B)
                  Magnetic method done clear
  C)
                  Fractional distillation            done clear
  D)
                  Dissolving in \[C{{S}_{2}}\] and filtering done clear
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• question_answer2)
  Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of                                      [Kerala CEE 2002]
  A)
                  Conservation of mass           done clear
  B)
                  Constant composition done clear
  C)
                  Multiple proportions             done clear
  D)
                  Constant volume done clear
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• question_answer3)
  Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be
  A)
                  45.3 g     done clear
  B)
                  4.53 g done clear
  C)
                  0.453 g   done clear
  D)
                  453 g done clear
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• question_answer4)
  10 \[d{{m}^{3}}\]of \[{{N}_{2}}\]gas and 10 \[d{{m}^{3}}\]of gas X at the same temperature contain the same number of molecules. The gas X is
  A)
                  \[CO\]      done clear
  B)
                  \[C{{O}_{2}}\] done clear
  C)
                  \[{{H}_{2}}\]        done clear
  D)
                  NO done clear
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• question_answer5)
  The molar heat capacity of water at constant pressure is 75 \[J{{K}^{-1}}\,\,mo{{l}^{-1}}\]. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increases in temperature of water is                                    [CBSE PMT 2003]
  A)
                  6.6 K       done clear
  B)
                  1.2 K done clear
  C)
                  2.4 K       done clear
  D)
                  4.8 K done clear
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• question_answer6)
  A compound possesses 8% sulphur by mass. The least molecular mass is                                                  [AIIMS 2002]
  A)
                  200         done clear
  B)
                  400 done clear
  C)
                  155         done clear
  D)
                  355 done clear
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• question_answer7)
  Which of the following contains maximum number of atoms         [JIPMER 2000]
  A)
                  \[6.023\times {{10}^{21}}\]molecules of \[C{{O}_{2}}\] done clear
  B)
                  22.4 L of \[C{{O}_{2}}\]at STP done clear
  C)
                  0.44 g of \[C{{O}_{2}}\] done clear
  D)
                  None of these done clear
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• question_answer8)
  In a mole of water vapour at STP, the volume actually occupied or taken by the molecules (i.e., Avogadro?s        No. \[\times \] Volume of one molecule) is           [Kerala EEE 2000]
  A)
                  Zero done clear
  B)
                  Less than 1% of 22.4 litres done clear
  C)
                  About 10% of the volume of container done clear
  D)
                  1% to 2% of 22.4 litres done clear
  E)
                  Between 2% to 5% of 22.4 litres done clear
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• question_answer9)
  If \[{{10}^{21}}\]molecules are removed from 200mg of \[C{{O}_{2}}\], then the number of moles of \[C{{O}_{2}}\]left are       [IIT 1983]
  A)
                  \[2.85\times {{10}^{-3}}\]                done clear
  B)
                  \[28.8\times {{10}^{-3}}\] done clear
  C)
                  \[0.288\times {{10}^{-3}}\]              done clear
  D)
                  \[1.68\times {{10}^{-2}}\] done clear
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• question_answer10)
  The set of numerical coefficient that balances the equation\[{{K}_{2}}Cr{{O}_{4}}+HCl\to {{K}_{2}}C{{r}_{2}}{{O}_{7}}+KCl+{{H}_{2}}O\] is [Kerala CEE 2001]
  A)
                  1, 1, 2, 2, 1            done clear
  B)
                  2, 2, 1, 1, 1 done clear
  C)
                  2, 1, 1, 2, 1            done clear
  D)
                  2, 2, 1, 2, 1 done clear
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• question_answer11)
  One litre hard water contains 12.00 mg \[M{{g}^{2+}}\]milli equivalent of washing soda required to remove its hardness is          [CBSE PMT 2001]
  A)
                  1              done clear
  B)
                  12.15 done clear
  C)
                  \[1\times {{10}^{-3}}\]      done clear
  D)
                  \[12.15\times {{10}^{-3}}\] done clear
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• question_answer12)
  In standardization of \[N{{a}_{2}}{{S}_{2}}{{O}_{3}}\] using \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] by iodometry, the equivalent weight of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\] is             [IIT 2000]
  A)
                  \[MW/2\] done clear
  B)
                  \[MW/3\] done clear
  C)
                  \[MW/6\] done clear
  D)
                  \[MW/1\] done clear
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• question_answer13)
  3.92 g of ferrous ammonium sulphate crystals are dissolved in 100 ml of water, 20 ml of this solution requires 18 ml of \[KMn{{O}_{4}}\] during titration for complete oxidation. The weight of \[KMn{{O}_{4}}\] present in one litre of the solution is [Tamilnadu  CET 2002]
  A)
                  3.476 g   done clear
  B)
                  12.38 g done clear
  C)
                  34.76 g   done clear
  D)
                  1.238 g done clear
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• question_answer14)
  A 100 ml solution of 0.1 n HCl was titrated with 0.2 N NaOH solution. The titration was discontinued after adding 30 ml of NaOH solution. The remaining titration was completed by adding 0.25 N KOH solution. The volume of KOH required for completing the titration is        [DCE 1999]
  A)
                  70 ml      done clear
  B)
                  32 ml done clear
  C)
                  35 ml      done clear
  D)
                  16 ml done clear
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• question_answer15)
  What volume of Hydrogen gas, at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by Hydrogen                                               [AIEEE 2003]
  A)
                  22.4 L     done clear
  B)
                  89.6 L done clear
  C)
                  67.2 L     done clear
  D)
                  44.8 L done clear
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• question_answer16)
  The mass of \[112\ c{{m}^{3}}\] of \[C{{H}_{4}}\] gas at STP is  [Karnataka CET  2001]
  A)
                  \[0.16\ g\]               done clear
  B)
                  \[0.8\ g\] done clear
  C)
                  \[0.08\ g\] done clear
  D)
                  \[1.6\ g\] done clear
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• question_answer17)
  Complete combustion of \[0.858\ g\] of compound X gives \[2.63\ g\] of \[C{{O}_{2}}\] and \[1.28\ g\] of \[{{H}_{2}}O\]. The lowest molecular mass X can have                                   [Kerala MEE 2000]
  A)
                  \[43\ g\]   done clear
  B)
                  \[86\ g\] done clear
  C)
                  \[129\ g\]                done clear
  D)
                  \[172\ g\] done clear
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• question_answer18)
  In the following reaction, which choice has value twice that of the equivalent mass of the oxidising agent                 \[S{{O}_{2}}+{{H}_{2}}O\xrightarrow{{}}3S+2{{H}_{2}}O\]                               [DPMT 2000]
  A)
                  64           done clear
  B)
                  32 done clear
  C)
                  16           done clear
  D)
                  48 done clear
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