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

done Mock Test - Some Basic Concepts of Chemistry Total Questions - 25

• question_answer1)
  X and Y are two elements which form \[{{X}_{2}}{{Y}_{3}}\] and \[{{X}_{3}}{{Y}_{4}}\]. If 0.20 mol of \[{{X}_{2}}{{Y}_{3}}\] weighs 32.0 g and 0.4 mol of \[{{X}_{3}}{{Y}_{4}}\] weighs 92.8 g, the atomic weights of \[X\] and\[Y\] Fare respectively
  A)
  16.0 and 56.0    done clear
  B)
  8.0 and 28.0 done clear
  C)
  56.0 and 16.0 done clear
  D)
  28.0 and 8.0 done clear
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• question_answer2)
  The percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (atomic weight = 78.4). Then minimum molecular weight of peroxidase anhydrous enzyme is
  A)
  \[15.68\]            done clear
  B)
  \[1.568\times {{10}^{3}}\] done clear
  C)
  \[1.568\times {{10}^{4}}\]        done clear
  D)
  \[3.136\times {{10}^{4}}\] 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)
  0.453 g done clear
  C)
  4.53 g done clear
  D)
  453 g done clear
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• question_answer4)
  A gaseous mixture contains \[C{{O}_{2}}(g)\] and \[{{N}_{2}}O(g)\] in 2 : 5 ratio by mass. The ratio of the number of molecules of \[C{{O}_{2}}(g)\]and \[{{N}_{2}}O(g)\]is
  A)
  5:2                    done clear
  B)
  2 : 5 done clear
  C)
  1 : 2                  done clear
  D)
  5 : 4 done clear
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• question_answer5)
  The minimum quantity in gram of \[{{H}_{2}}S\] needed to precipitate 63.5 g of \[C{{u}^{{{2}^{+}}}}\] will be \[(C{{u}^{{{2}^{+}}}}+{{H}_{2}}S\to C{{u}_{2}}S+{{H}_{2}})\] Black
  A)
  63.5 g   done clear
  B)
  31.75 g done clear
  C)
  34 g      done clear
  D)
  2 g done clear
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• question_answer6)
  The mass of 70% \[{{H}_{2}}S{{O}_{4}}\] required for neutralisation of 1 mol of NaOH.
  A)
  49 g                  done clear
  B)
  98 g done clear
  C)
  70 g      done clear
  D)
  34.3 g done clear
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• question_answer7)
  For the reaction \[2x+3y+4z\to 5w\] Initially if 1 mole of x, 3 moles of y and 4 moles of z is taken. If 1.25 moles of w is obtained then % yield of this reaction is
  A)
  50%      done clear
  B)
  60% done clear
  C)
  70%                  done clear
  D)
  40% done clear
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• question_answer8)
  Which of the following changes with increase in Temperature?
  A)
  Molality done clear
  B)
  Weight fraction of solute done clear
  C)
  Fraction of solute present in water done clear
  D)
  Mole fraction done clear
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• question_answer9)
  Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
  A)
  0.44 mol \[k{{g}^{-1}}\] done clear
  B)
  1.14 mol \[k{{g}^{-1}}\] done clear
  C)
  3.28 mol \[k{{g}^{-1}}\] done clear
  D)
  2.28 mol \[k{{g}^{-1}}\] done clear
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• question_answer10)
  A gaseous hydrocarbon gives upon combustion, 0.72 g of water and 3.08 g of \[C{{O}_{2}}\] The empirical formula of the hydrocarbon is
  A)
  \[{{C}_{2}}{{H}_{4}}\]           done clear
  B)
  \[{{C}_{3}}{{H}_{4}}\] done clear
  C)
  \[{{C}_{6}}{{H}_{5}}\]           done clear
  D)
  \[{{C}_{7}}{{H}_{8}}\] done clear
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• question_answer11)
  To neutralize completely 20 mL of 0.l M aqueous solution of phosphorus (\[{{H}_{3}}P{{O}_{3}}\]) acid the volume of 0.1 M aqueous KOH solution required is
  A)
  60 mL   done clear
  B)
  20 mL done clear
  C)
  40 mL done clear
  D)
  10 mL done clear
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• question_answer12)
  1.0 g of a monobasic acid when completely acted upon Mg gave 1.301 g of anhydrous Mg salt. Equivalent weight of acid is
  A)
  35.54    done clear
  B)
  36.54 done clear
  C)
  17.77    done clear
  D)
  18.27 done clear
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• question_answer13)
  If 0.5 mole of \[BaC{{l}_{2}}\]is mixed with 0,20 mole of \[N{{a}_{3}}P{{O}_{4}}\], the maximum number of moles of\[B{{a}_{3}}(P{{O}_{4}})\] that can be formed is
  A)
  0.1        done clear
  B)
  0.2 done clear
  C)
  0.5                    done clear
  D)
  0.7 done clear
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• question_answer14)
  5.6 g of a metal forms 12.7 g of metal chloride. Hence equivalent weight of the metal is
  A)
  127                   done clear
  B)
  254 done clear
  C)
  56                     done clear
  D)
  28 done clear
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• question_answer15)
  The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is:
  A)
  \[XY\]                done clear
  B)
  \[{{X}_{2}}Y\] done clear
  C)
  \[{{X}_{{}}}{{Y}_{2}}\]                      done clear
  D)
  \[{{X}_{2}}{{Y}_{3}}\] done clear
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• question_answer16)
  Mole fraction of ethanol in ethanol water mixture is 0.25. Hence, the percentage concentration of ethanol by weight of mixture is
  A)
  25%                  done clear
  B)
  75% done clear
  C)
  46%      done clear
  D)
  54% done clear
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• question_answer17)
  \[Br{{O}_{3}}^{\odot }+5B{{r}^{\odot }}\to B{{r}_{2}}+3{{H}_{2}}O\]If 50 mL 0.1 M \[Br{{O}_{3}}^{\odot }\] is mixed with 30 mL of 0.5 M  \[B{{r}^{\Theta }}\]solution that contains excess of \[{{H}^{\oplus }}\] ions, the moles of \[B{{r}_{2}}\] formed are
  A)
  \[6.0\times {{10}^{-4}}\]          done clear
  B)
  \[1.2\times {{10}^{-4}}\] done clear
  C)
  \[9.0\times {{10}^{-3}}\] done clear
  D)
  \[1.8\times {{10}^{-3}}\] done clear
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• question_answer18)
  A sample of pure carbon dioxide, irrespective of its source contains 27.27% carbon and 72.73% oxygen. The data support
  A)
  Law of constant composition done clear
  B)
  Law of conservation of mass done clear
  C)
  Law of reciprocal proportions done clear
  D)
  Law of multiple proportions done clear
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• question_answer19)
  Given that the abundance of isotopes \[^{54}Fe\], \[^{56}Fe\] and \[^{57}Fe\] is 5%, 90% and 5%, respectively. The atomic mass of Fe is
  A)
  55.85    done clear
  B)
  55.95 done clear
  C)
  55.75    done clear
  D)
  55.05 done clear
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• question_answer20)
  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
  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_answer21)
  A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 ml and 25.0 mL. The number of significant figures in the average titre value is
  A)
  3 done clear
  B)
  4 done clear
  C)
  5 done clear
  D)
  6 done clear
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• question_answer22)
  Valency factors for \[C{{u}_{2}}S\] and \[C{{u}_{{}}}S\] is x and y respectively when they react with KMn\[{{O}_{4}}\] in acidic medium. What is the value of x- y?
  A)
  4 done clear
  B)
  2 done clear
  C)
  5 done clear
  D)
  6 done clear
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• question_answer23)
  How many \[{{N}_{4}}\] electron is present in 5.1 g \[N{{H}_{3}}\] ?
  A)
  1 done clear
  B)
  2 done clear
  C)
  3 done clear
  D)
  4 done clear
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• question_answer24)
  29.2 % (w/w) HCl stock solution has density of 1.25 g \[m{{L}^{-1}}\]. The molecular weight of HCl is 36.5 g \[mo{{l}^{-1}}\]. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is
  A)
  6 done clear
  B)
  5 done clear
  C)
  3 done clear
  D)
  8 done clear
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• question_answer25)
  How many litre of 2 M \[{{H}_{3}}As{{o}_{4}}\] require to prepare 4 litres of l M \[{{H}_{3}}As{{o}_{4}}\]?
  A)
  0 done clear
  B)
  6 done clear
  C)
  8 done clear
  D)
  2 done clear
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