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

done Topic Test - Some Basic Concepts of Chemistry (8-5-21) Total Questions - 40

• question_answer1)
  A picometre is written as
  A)
  \[{{10}^{-9}}\]m done clear
  B)
  \[{{10}^{-10}}\]m done clear
  C)
  \[{{10}^{-11}}\]m done clear
  D)
  \[{{10}^{-12}}\]m done clear
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• question_answer2)
  Given \[P=0.0030m\], \[Q=2.40m\], \[R=3000m\], Significant figures in \[P,\,Q\] and \[R\] are respectively
  A)
  2, 2, 1 done clear
  B)
  2, 3, 4 done clear
  C)
  4, 2, 1 done clear
  D)
  4, 2, 3 done clear
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• question_answer3)
  The percentage of copper and oxygen in samples of \[CuO\] obtained by different methods were found to be the same. This illustrates the law of
  A)
  Constant proportions       done clear
  B)
  Conservation of mass      done clear
  C)
  Multiple proportions         done clear
  D)
  Reciprocal proportions done clear
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• question_answer4)
  Hydrogen combines with oxygen to form \[{{H}_{2}}O\] in which 16 g of oxygen combine with 2 g of hydrogen. Hydrogen also combines with carbon to form \[C{{H}_{4}}\] in which 2 g of hydrogen combine with 6 g of carbon. If carbon and oxygen combine together then they will do show in the ratio of
  A)
  6 : 16 or 12 : 32 done clear
  B)
  6 : 18 done clear
  C)
  1 : 2 done clear
  D)
  12 : 24 done clear
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• question_answer5)
  The modern atomic weight scale is based on
  A)
  \[{{C}^{12}}\] done clear
  B)
  \[{{O}^{16}}\] done clear
  C)
  \[{{H}^{1}}\] done clear
  D)
  \[{{C}^{13}}\] done clear
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• question_answer6)
  7.5 grams of a gas occupy 5.8 litres of volume at STP the gas is
  A)
  \[NO\]   done clear
  B)
  \[{{N}_{2}}O\] done clear
  C)
  \[CO\]   done clear
  D)
  \[C{{O}_{2}}\] done clear
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• question_answer7)
  A gaseous mixture contains \[C{{H}_{4}}\] and \[{{C}_{2}}{{H}_{6}}\] in equimolecular proportion. The weight of 2.24 litres of this mixture at NTP is
  A)
  4.6 g     done clear
  B)
  1.6 g done clear
  C)
  2.3 g done clear
  D)
  23 g done clear
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• question_answer8)
  Equivalent weight of a bivalent metal is 37.2. The molecular weight of its chloride is   
  A)
  412.2 done clear
  B)
  216 done clear
  C)
  145.4 done clear
  D)
  108.2 done clear
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• question_answer9)
  The number of oxygen atoms in 4.4 g of \[C{{O}_{2}}\]is approx. 
  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_answer10)
  The numbers of moles of \[BaC{{O}_{3}}\]which contain 1.5 moles of oxygen atoms is                    
  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_answer11)
  The percentage of oxygen in \[NaOH\] is
  A)
  40 done clear
  B)
  60 done clear
  C)
  8 done clear
  D)
  10 done clear
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• question_answer12)
  In which of the following pairs of compounds the ratio of C, H and O is same
  A)
  Acetic acid and methyl alcohol done clear
  B)
  Glucose and acetic acid done clear
  C)
  Fructose and sucrose done clear
  D)
  All of these done clear
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• question_answer13)
  2.76 g of silver carbonate on being strongly heated yield a residue weighing                
  A)
  2.16 g done clear
  B)
  2.48 g done clear
  C)
  2.64 g done clear
  D)
  2.32 g done clear
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• question_answer14)
  Approximate atomic weight of an element is 26.89. If its equivalent weight is 8.9, the exact atomic weight of element would be           
  A)
  26.89 done clear
  B)
  8.9 done clear
  C)
  17.8 done clear
  D)
  26.7 done clear
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• question_answer15)
  Number of moles of \[KMn{{O}_{4}}\]required to oxidize one mole of \[Fe({{C}_{2}}{{O}_{4}})\]in acidic medium is
  A)
  0.6 done clear
  B)
  0.167 done clear
  C)
  0.2 done clear
  D)
  0.4 done clear
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• question_answer16)
  \[1.5\] mol of \[{{O}_{2}}\] combine with \[Mg\] to form oxide \[MgO\]. The mass of \[Mg\] (at. mass 24) that has combined is
  A)
  \[72\ g\] done clear
  B)
  \[36\ g\] done clear
  C)
  \[48\ g\] done clear
  D)
  \[24\ g\] done clear
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• question_answer17)
  One atmosphere is equal to
  A)
  101.325 K pa done clear
  B)
  1013.25 K pa done clear
  C)
  \[{{10}^{5}}\]Nm done clear
  D)
  None of these done clear
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• question_answer18)
  81.4 g sample of ethyl alcohol contains 0.002 g of water. The amount of pure ethyl alcohol to the proper number of significant figures is
  A)
  81.398 g done clear
  B)
  71.40 g done clear
  C)
  91.4 g done clear
  D)
  81 g done clear
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• question_answer19)
  A sample was weighted using two different balances. The result’s were (i) 3.929 g (ii) 4.0 g. How would the weight of the sample be reported?
  A)
  3.929 g done clear
  B)
  3 g done clear
  C)
  3.9 g     done clear
  D)
  3.93 g done clear
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• question_answer20)
  Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1 : 2 : 3 : 4 : 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and       
  A)
  32 parts by weight of Y    done clear
  B)
  48 parts by weight of Y    done clear
  C)
  64 parts by weight of Y    done clear
  D)
  80 parts by weight of Y done clear
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• question_answer21)
  The law of multiple proportions is illustrated by the two compounds              
  A)
  Sodium chloride and sodium bromide done clear
  B)
  Ordinary water and heavy water done clear
  C)
  Caustic soda and caustic potash done clear
  D)
  Sulphur dioxide and sulphur trioxide done clear
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• question_answer22)
  The law of definite proportions is not applicable to nitrogen oxide because                 
  A)
  Nitrogen atomic weight is not constant done clear
  B)
  Nitrogen molecular weight is variable done clear
  C)
  Nitrogen equivalent weight is variable done clear
  D)
  Oxygen atomic weight is variable done clear
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• question_answer23)
  When 100 ml of 1\[M\,NaOH\]solution and 10 ml of 10\[N\,{{H}_{2}}S{{O}_{4}}\]solution are mixed together, the resulting solution will be   
  A)
  Alkaline done clear
  B)
  Acidic done clear
  C)
  Strongly acidic done clear
  D)
  Neutral done clear
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• question_answer24)
  One litre of a gas at STP weight 1.16 g it can possible be
  A)
  \[{{C}_{2}}{{H}_{2}}\] done clear
  B)
  \[CO\] done clear
  C)
  \[{{O}_{2}}\] done clear
  D)
  \[C{{H}_{4}}\] done clear
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• question_answer25)

  Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from , , and (Atomic mass: N=14, O=16, Cu=63).

  1 molecule of oxygen

  1 atom of nitrogen

  \[1\times {{10}^{-10}}\]g molecular weight of oxygen

  \[1\times {{10}^{-10}}\]g atomic weight of copper

  A)
  II<I<III<IV done clear
  B)
  IV<III<II<I done clear
  C)
  II<III<I<IV done clear
  D)
  III<IV<I<II done clear
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• question_answer26)
  Vapour density of a metal chloride is 66. Its oxide contains 53% metal. The atomic weight of the metal is
  A)
  21 done clear
  B)
  54 done clear
  C)
  27.06 done clear
  D)
  2.086 done clear
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• question_answer27)
  \[4.4\ g\] of an unknown gas occupies \[2.24L\] of volume at standard temperature and pressure. The gas may be
  A)
  Carbon dioxide done clear
  B)
  Carbon monoxide done clear
  C)
  Oxygen done clear
  D)
  Sulphur dioxide done clear
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• question_answer28)
  On reduction with hydrogen, 3.6 g of an oxide of metal left 3.2 g of metal. If the vapour density of metal is 32, the simplest formula of the oxide would be
  A)
  \[MO\] done clear
  B)
  \[{{M}_{2}}{{O}_{3}}\] done clear
  C)
  \[{{M}_{2}}O\]0 done clear
  D)
  \[{{M}_{2}}{{O}_{5}}\] done clear
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• question_answer29)
  One mole of calcium phosphide on reaction with excess of water gives                                  
  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_answer30)
  How many molecules are present in one gram of hydrogen
  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_answer31)
  A compound (80 g) on analysis gave C = 24 g, H = 4 g,   O = 32 g. Its empirical formula is  
  A)
  \[{{C}_{2}}{{H}_{2}}{{O}_{2}}\] done clear
  B)
  \[{{C}_{2}}{{H}_{2}}O\] done clear
  C)
  \[C{{H}_{2}}{{O}_{2}}\] done clear
  D)
  \[C{{H}_{2}}O\] done clear
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• question_answer32)
  Haemoglobin contains 0.33% of iron by weight. The molecular weight of haemoglobin is approximately 67200. The number of iron atoms (At. wt. of Fe = 56) present in one molecule of haemoglobin is     
  A)
  6 done clear
  B)
  1 done clear
  C)
  4 done clear
  D)
  2 done clear
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• question_answer33)
  How many g of a dibasic acid (Mol. wt. = 200) should be present in 100 ml of its aqueous solution to give decinormal strength           
  A)
  1 g done clear
  B)
  2 g done clear
  C)
  10 g done clear
  D)
  20 g done clear
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• question_answer34)
  To neutralise 20 ml of \[M/10\] sodium hydroxide, the volume of \[M/20\] hydrochloric acid required is
  A)
  10 ml done clear
  B)
  15 ml done clear
  C)
  20 ml done clear
  D)
  40 ml done clear
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• question_answer35)
  A solution containing \[N{{a}_{2}}C{{O}_{3}}\] and NaOH requires 300 ml of 0.1 N HCl using phenolpthalein as an indicator. Methyl orange is then added to the above titrated solution when a further 25 ml of 0.2 N HCl is required. The amount of NaOH present in solution is \[(NaOH=40,\,N{{a}_{2}}C{{O}_{3}}=106)\]
  A)
  0.6 g     done clear
  B)
  1.0 g done clear
  C)
  1.5 g     done clear
  D)
  2.0 g done clear
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• question_answer36)
  The ratio of amounts of \[{{H}_{2}}S\]needed to precipitate all the metal ions from 100 ml of 1 M \[AgN{{O}_{3}}\]and 100 ml of 1 M \[CuS{{O}_{4}}\]will be
  A)
  1:1 done clear
  B)
  1:2 done clear
  C)
  2:1 done clear
  D)
  None of these done clear
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• question_answer37)
  What should be the weight and moles of \[AgCl\]precipitate obtained on adding 500ml of 0.20 M \[HCl\]in 30 g of \[AgN{{O}_{3}}\]solution? (\[AgN{{O}_{3}}\]= 170)
  A)
  14.35 g done clear
  B)
  15 g done clear
  C)
  18 g done clear
  D)
  19 g done clear
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• question_answer38)
  What will be the volume of \[C{{O}_{2}}\]at NTP obtained on heating 10 grams of (90% pure) limestone
  A)
  22.4 litre done clear
  B)
  2.016 litre done clear
  C)
  2.24 litre done clear
  D)
  20.16 litre done clear
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• question_answer39)
  \[Ca{{(OH)}_{2}}+{{H}_{3}}P{{O}_{4}}\to CaHP{{O}_{4}}+2{{H}_{2}}O\] the equivalent weight of \[{{H}_{3}}P{{O}_{4}}\] in the above reaction is
  A)
  21 done clear
  B)
  27 done clear
  C)
  38 done clear
  D)
  49 done clear
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• question_answer40)
  How many grams of caustic potash required to completely neutralise 12.6 gm \[HN{{O}_{3}}\]
  A)
  22.4 KOH done clear
  B)
  1.01 KOH done clear
  C)
  6.02 KOH done clear
  D)
  11.2 KOH done clear
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