9th Class Science Structure of the Atom Question Bank

done Nature of Matter Total Questions - 66

• question_answer1)
  Number of atoms in 12 gm of \[_{6}{{\text{C}}^{\text{12}}}\]will be
  A)
   \[6\]                                     done clear
  B)
   12 done clear
  C)
  \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\]          done clear
  D)
          \[\text{6 }\times \text{ 6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] done clear
  View Solution play_arrow

• question_answer2)
  Number of gm atoms of sulphur present in 80.25 gm of sulphur (At. Wt. of \[S=32\])
  A)
   32                          done clear
  B)
          5 done clear
  C)
   10                          done clear
  D)
          2.5   done clear
  View Solution play_arrow

• question_answer3)
  One mole of \[C{{O}_{2}}\] contains
  A)
    \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\] atoms of \[O\] done clear
  B)
   \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of carbon}\]   done clear
  C)
   \[\text{18}.\text{1}0\text{ }\times \text{ 1}{{0}^{\text{23}}}\text{ molecules of C}{{\text{O}}_{2}}\] done clear
  D)
   \[\text{3 gm atoms of C}{{\text{O}}_{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer4)
  Which of the following has smallest number of molecules?
  A)
   \[0.1\,\,mole\,\,of\,C{{O}_{2}}\,gas\]   done clear
  B)
   \[\text{11}\text{.2 litres of C}{{\text{O}}_{\text{2}}}\text{ gas}\] done clear
  C)
  \[\text{22 gm of C}{{\text{O}}^{\text{2}}}\text{ gas}\] done clear
  D)
   \[\text{22}.\text{4 }\times \text{ 1}03\,\,\,\text{ml of C}{{\text{O}}^{\text{2}}}\text{ gas}\] done clear
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• question_answer5)
  A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the
  A)
   law of conservation of mass done clear
  B)
   law of constant composition   done clear
  C)
   law of multiple proportion done clear
  D)
   law of reciprocal proportion done clear
  View Solution play_arrow

• question_answer6)
  The law of multiple proportion was discovered by
  A)
   John Dalton        done clear
  B)
          Richter done clear
  C)
   Joseph Proust    done clear
  D)
          A. Lavoisier done clear
  View Solution play_arrow

• question_answer7)
  10.0 g of\[\text{CaC}{{\text{O}}_{\text{3}}}\]  on heating gave \[\text{4}\text{.4 g}\]of \[\text{C}{{\text{O}}_{\text{2}}}\]and 5.6 g of\[CaO\]. The observation is in agreement with the
  A)
   law of constant composition done clear
  B)
   law of multiple proportion done clear
  C)
   law of reciprocal proportion done clear
  D)
   law of conservation of mass   done clear
  View Solution play_arrow

• question_answer8)
  Number of electrons in one mole of hydrogen is
  A)
  \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\]       done clear
  B)
          \[\text{12}.0\text{46 }\times \text{ 1}{{0}^{\text{23}}}\]   done clear
  C)
  \[\text{3}.0\text{115 }\times \text{ 1}{{0}^{\text{23}}}\]     done clear
  D)
         indefinite done clear
  View Solution play_arrow

• question_answer9)
  Number of moles present in 128 gm of sulphur is
  A)
   4                                             done clear
  B)
   1 done clear
  C)
   8                             done clear
  D)
          0.5   done clear
  View Solution play_arrow

• question_answer10)
  A gas is found to have molecular formula \[(CO)x\] Its V.D. is 70. The value of \[x\] will be       
  A)
   3                             done clear
  B)
          4 done clear
  C)
   5                               done clear
  D)
          6                done clear
  View Solution play_arrow

• question_answer11)
  If a gas is expanded at constant temperature
  A)
   the pressure increases                done clear
  B)
   the kinetic energy of the molecules remains the same                               done clear
  C)
   the kinetic energy of the molecules  decrease done clear
  D)
   the number of molecules of the gas increases done clear
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• question_answer12)
  Atoms of the same two elements can combine in different ratios to form different compounds This is                                 
  A)
   law of constant composition             done clear
  B)
   law of multiple proportion   done clear
  C)
   law of reciprocal proportion              done clear
  D)
   law of conservation of mass done clear
  View Solution play_arrow

• question_answer13)
  Correct gas equation is
  A)
   \[\frac{{{V}_{1}}{{T}_{2}}}{{{P}_{1}}}=\frac{{{V}_{2}}{{T}_{1}}}{{{P}_{2}}}\]                          done clear
  B)
   \[\frac{{{P}_{1}}{{V}_{1}}}{{{P}_{2}}{{V}_{2}}}=\frac{{{T}_{1}}}{{{T}_{2}}}\]   done clear
  C)
   \[\frac{{{P}_{1}}{{T}_{2}}}{{{V}_{1}}}=\frac{{{P}_{2}}{{V}_{2}}}{{{T}_{2}}}\]          done clear
  D)
          \[\frac{{{V}_{1}}{{V}_{2}}}{{{T}_{1}}{{T}_{2}}}={{P}_{1}}{{P}_{2}}\] done clear
  View Solution play_arrow

• question_answer14)
  The mass of one molecule of water is approximately
  A)
  \[3\times {{10}^{-23}}\,g\]           done clear
  B)
          18 g done clear
  C)
  \[\text{1}.\text{5 }\times \text{ 1}{{0}^{-\text{23}}}\text{ g}\]       done clear
  D)
          \[\text{4}.\text{5 }\times \text{ 1}{{0}^{-\text{23}}}\text{ g}\] done clear
  View Solution play_arrow

• question_answer15)
  Which one of the following properties of an element is not variable?
  A)
   Valency          done clear
  B)
          Atomic weight   done clear
  C)
   Equivalent weight           done clear
  D)
   All of these done clear
  View Solution play_arrow

• question_answer16)
  The process of making colloidal solution from the precipitate is called
  A)
   coagulation        done clear
  B)
          vulcanization done clear
  C)
   peptization         done clear
  D)
          flocculation done clear
  View Solution play_arrow

• question_answer17)
  Colloidal particles show Tyndall effect due to
  A)
   Scattering of light              done clear
  B)
   Reflection of light done clear
  C)
   Refraction of light           done clear
  D)
   Polarisation of light done clear
  View Solution play_arrow

• question_answer18)
  The inter particle forces in solid hydrogen are
  A)
   Hydrogen bonds             done clear
  B)
   Covalent bonds done clear
  C)
   Co-ordinate bond           done clear
  D)
   Vander Waal?s  forces   done clear
  View Solution play_arrow

• question_answer19)
  Brass in an example of a
  A)
   homogeneous compound done clear
  B)
   homogeneous mixture   done clear
  C)
   heterogeneous mixture done clear
  D)
   heterogeneous compound done clear
  View Solution play_arrow

• question_answer20)
  A mixture of sand and iodine can be separated by
  A)
   Distillation        done clear
  B)
          Fractionation done clear
  C)
   Sublimation         done clear
  D)
          Filtration done clear
  View Solution play_arrow

• question_answer21)
  Which of the following statement is wrong?
  A)
   At room temperature evaporation of water is rapid as compared to ethanol   done clear
  B)
   Water is more viscous as compared to ethanol done clear
  C)
   Liquid drops are spherical in shape done clear
  D)
   Clothes are easily dried in dry day as compared to humid days done clear
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• question_answer22)
  Which of the following is not a compound?
  A)
   Sulphur dioxide  done clear
  B)
         Chalk done clear
  C)
   Lead                       done clear
  D)
          Sulphuric acid done clear
  View Solution play_arrow

• question_answer23)
  The mass of sodium in 11.7 g of sodium chloride is
  A)
   2.3 g                      done clear
  B)
          4.6 g   done clear
  C)
   6.9 g                      done clear
  D)
          7.1g done clear
  View Solution play_arrow

• question_answer24)
  27 gm aluminium will react completely with
  A)
   32 gm oxygen     done clear
  B)
          24 gm oxygen   done clear
  C)
   16 gm oxygen    done clear
  D)
          8 gm oxygen done clear
  View Solution play_arrow

• question_answer25)
  Which has maximum number of atoms ?
  A)
  \[\text{24 g of C }\left( \text{12} \right)\]      done clear
  B)
         \[\text{56 g of Fe}\left( \text{56} \right)\] done clear
  C)
  \[\text{27 g of Al }\left( \text{27} \right)\]  done clear
  D)
          \[\text{1}0\text{8 g of Ag }\left( \text{1}0\text{8} \right)\] done clear
  View Solution play_arrow

• question_answer26)
  Which one of the following is a pseudo solid?
  A)
   \[Ca{{F}_{2}}\]                 done clear
  B)
          Glass   done clear
  C)
   \[NaCl\]             done clear
  D)
          All of these done clear
  View Solution play_arrow

• question_answer27)
  The weight of two elements which combine with one another are in the ratio of their
  A)
   Atomic weight    done clear
  B)
          Molecular weight done clear
  C)
   Gram mole       done clear
  D)
          Equivalent weight   done clear
  View Solution play_arrow

• question_answer28)
  At higher altitude the boiling point of water lowers because.
  A)
   Atmospheric pressure is low   done clear
  B)
   Temperature is low done clear
  C)
   Atmospheric pressure is high done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer29)
  Fog is an example of a colloidal system of
  A)
   Liquid dispersed in gas   done clear
  B)
   Gas dispersed in gas done clear
  C)
   Solid dispersed in gas done clear
  D)
   Solid dispersed in liquid done clear
  View Solution play_arrow

• question_answer30)
  2 g of hydrogen will have same number of molecules as is present in
  A)
   14 gm of nitrogen           done clear
  B)
  \[\text{32 gm of S}{{\text{O}}_{\text{2}}}\] done clear
  C)
   71 gm of chlorine              done clear
  D)
   24 gm of ozone done clear
  View Solution play_arrow

• question_answer31)
  How many gms of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]are present m 0.25 mole of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]?
  A)
   0.25                       done clear
  B)
          25.00 done clear
  C)
   24.50                      done clear
  D)
          2.45 done clear
  View Solution play_arrow

• question_answer32)
  When the same amount of zinc metal is treated separately with excess of \[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\]and excess of\[\text{NaOH}\], the ratio of the volumes of \[{{\text{H}}_{\text{2}}}\]evolved is
  A)
   1 : 1                                         done clear
  B)
   1 : 2 done clear
  C)
   2:1                         done clear
  D)
          None of these done clear
  View Solution play_arrow

• question_answer33)
  For ultrafiltration, ordinary filter paper is impregnated in a solution of
  A)
   Collodian              done clear
  B)
   Starch done clear
  C)
   Gum                     done clear
  D)
          Silicic acid done clear
  View Solution play_arrow

• question_answer34)
  Alum purifies water due to
  A)
   Adsorption       done clear
  B)
   Peptisation done clear
  C)
   Coagulation        done clear
  D)
          Dialysis done clear
  View Solution play_arrow

• question_answer35)
  The Zig-Zag random motion of colloidal particle in a dispersion medium is called
  A)
   Brownian motion              done clear
  B)
   Tyndall effect done clear
  C)
   Electrophoresis  done clear
  D)
         Electro-osmosis done clear
  View Solution play_arrow

• question_answer36)
  1 mole of methan contain
  A)
   \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of H}\] done clear
  B)
   4 gram atom of hydrogen   done clear
  C)
   \[\text{1}.\text{81 }\times \text{ 1}{{0}^{\text{23}}}\]molecules of methane done clear
  D)
   3.0 g of carbon done clear
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• question_answer37)
  On heating a liquid, its surface tension
  A)
   increases         done clear
  B)
          decreases   done clear
  C)
   ramains same    done clear
  D)
          is reduced to zero done clear
  View Solution play_arrow

• question_answer38)
  The emperical formula of sucrose is
  A)
   \[C{{H}_{2}}O\]                done clear
  B)
          CHO done clear
  C)
  \[{{C}_{12}}{{H}_{22}}{{O}_{11}}\]                              done clear
  D)
   \[C{{({{H}_{2}}O)}_{2}}\] done clear
  View Solution play_arrow

• question_answer39)
  Number of water molecules in one litre of pure water is
  A)
  \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\]       done clear
  B)
         \[\text{3}.\text{45 }\times \text{ 1}{{0}^{\text{25}}}\]   done clear
  C)
  \[\text{55}.\text{4 }\times \text{ 1}{{0}^{\text{23}}}\]        done clear
  D)
          \[\text{18 }\times \text{ 1}{{0}^{\text{23}}}\] done clear
  View Solution play_arrow

• question_answer40)
  Number of moles of water in 1.8 litre of pure water is (Density of water = 1 g/ml)
  A)
   18                          done clear
  B)
          100   done clear
  C)
   36                                          done clear
  D)
   55.4 done clear
  View Solution play_arrow

• question_answer41)
  Number of  ions in one litre of pure water is
  A)
  \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\]       done clear
  B)
          \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{16}}}\]   done clear
  C)
  \[\text{3}.0\text{2 }\times \text{ l}{{0}^{\text{23}}}\]                     done clear
  D)
   \[1\times \text{1}{{\text{0}}^{-\text{7}}}\] done clear
  View Solution play_arrow

• question_answer42)
  The molar mass of an electron is
  A)
   \[\text{6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\text{ g}/\text{mol}\] done clear
  B)
   \[\text{5}.\text{486 }\times \text{ 1}{{0}^{-\text{4}}}\text{ g}/\text{mol}\]   done clear
  C)
   \[9.108\times {{10}^{-28}}Kg/mol\] done clear
  D)
   \[\text{9}.\text{1}0\text{8 }\times \text{l}{{0}^{-\text{24}}}\text{ g}/\text{mol}\] done clear
  View Solution play_arrow

• question_answer43)
  Active mass of 6% solution of compound \[\text{X}\] is 2. Molecular weight of \[\text{X}\] would be
  A)
   6                             done clear
  B)
          30   done clear
  C)
   60                          done clear
  D)
          90 done clear
  View Solution play_arrow

• question_answer44)
  The mass of an atom of nitrogen is
  A)
  \[\frac{14}{6.023\times {{10}^{23}}}g\]      done clear
  B)
          \[\frac{28}{6.023\times {{10}^{23}}}g\] done clear
  C)
   \[\frac{1}{6.023\times {{10}^{23}}}g\]    done clear
  D)
          \[14\,a.m.u.\] done clear
  View Solution play_arrow

• question_answer45)
  Empirical formula of a compound is\[C{{H}_{2}}O\]. Its molecular mass is 60. The molecular formula will be
  A)
   \[C{{H}_{2}}O\]                done clear
  B)
          \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\]   done clear
  C)
   \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\]                  done clear
  D)
          None of these done clear
  View Solution play_arrow

• question_answer46)
  Number of gram-atoms in 8 g of He are
  A)
   2                                               done clear
  B)
   \[\text{1}.\text{2}0\text{4 }\times \text{ 1}{{0}^{\text{24}}}\] done clear
  C)
  \[\text{3}.\text{1}0\text{ }\times \text{ 1}{{0}^{\text{23}}}\]                      done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer47)
  Which of the following contains the largest number of molecules?
  A)
  \[0.\text{2 mole of }{{\text{H}}_{2}}\]    done clear
  B)
          \[\text{8}.0\text{ g of }{{\text{H}}_{\text{2}}}\]   done clear
  C)
  \[\text{17 g of }{{\text{H}}_{\text{2}}}\text{O}\]       done clear
  D)
          \[\text{6}.0\text{ g of C}{{\text{O}}_{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer48)
  4.0 grams of caustic soda contains
  A)
   \[\text{6}.0\text{2 }\times \text{l}{{0}^{\text{23}}}\text{ atoms of H}\] done clear
  B)
   4 g atoms of Na done clear
  C)
   \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{23}}}\text{ atoms of Na}\]   done clear
  D)
   \[\text{4 moles of NaOH}\] done clear
  View Solution play_arrow

• question_answer49)
  If two compounds have the same empirical formula but different molecular formula, they must have
  A)
   Different percentage composition done clear
  B)
   Different molecular weight   done clear
  C)
   Same viscosity done clear
  D)
   Same vapour density done clear
  View Solution play_arrow

• question_answer50)
  When molten form of crystalline solid is rapidly cooled, it changes into
  A)
   Crystalline solid  done clear
  B)
          Amorphous solid done clear
  C)
   Insulator           done clear
  D)
          Super conductor done clear
  View Solution play_arrow

• question_answer51)
  Artificial rain based on the principle of
  A)
   Coagulation   done clear
  B)
   Electro phroetic effect done clear
  C)
   Emulsification done clear
  D)
   Tyndall effect done clear
  View Solution play_arrow

• question_answer52)
  Liquid drops assume spherical shape because
  A)
   A sphere has maximum surface area done clear
  B)
   A sphere has minimum surface area   done clear
  C)
   Sphere is symmetrical in shape done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer53)
  Equivalent weight of crystalline oxalic acid is
  A)
   90                          done clear
  B)
          63   done clear
  C)
   53                          done clear
  D)
          45 done clear
  View Solution play_arrow

• question_answer54)
  What is the total number of atoms present in 25.0 mg of camphor, \[{{C}_{10}}{{H}_{16}}O\] ?
  A)
  \[~\text{9}.\text{89 }\times \text{ 1}{{0}^{\text{19}}}\]                 done clear
  B)
   \[\text{2}.\text{67 }\times \text{ 1}{{0}^{\text{21}}}\]   done clear
  C)
  \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{2}0}}\]                   done clear
  D)
   \[\text{2}.\text{57 }\times \text{ 1}{{0}^{\text{21}}}\] done clear
  View Solution play_arrow

• question_answer55)
  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 phosphorous pentoxide done clear
  View Solution play_arrow

• question_answer56)
  The number of gram molecules of oxygen in \[\text{6}.0\text{2 }\times \text{ 1}{{0}^{\text{24}}}\] CO molecules is
  A)
   10 g molecules                 done clear
  B)
   5g molecules done clear
  C)
   1g molecule                       done clear
  D)
   0.5 molecule   done clear
  View Solution play_arrow

• question_answer57)
  The substance which gives colloidal solution in water is
  A)
   sugar                                    done clear
  B)
   soap   done clear
  C)
   alum                                     done clear
  D)
   plaster of parts done clear
  View Solution play_arrow

• question_answer58)
  The mass of magnesium oxide formed by burning 1.216 g magnesium in excess oxygen is
  A)
   0.416 g done clear
  B)
   1.616 g   done clear
  C)
   2.016 g done clear
  D)
   2.816 g done clear
  View Solution play_arrow

• question_answer59)
  Which of the following samples contain the smallest number of atoms?
  A)
   \[\text{1 g of C}{{\text{O}}_{\text{2}}}\text{ }\left( \text{g} \right)\]   done clear
  B)
   \[\text{1 g of }{{\text{C}}_{8}}{{\text{H}}_{18}}\left( 1 \right)\] done clear
  C)
   \[\text{1 g of }{{\text{C}}_{2}}{{\text{H}}_{6}}\left( g \right)\] done clear
  D)
   \[\text{1 g of LiF}\left( S \right)\] done clear
  View Solution play_arrow

• question_answer60)
  1 g of an oxide of A contained 0.5 g of A, 4 g of another oxide of A contained 1.6 g of A. These figures illustrate the law of
  A)
   conservation of mass done clear
  B)
   reciprocal proportions done clear
  C)
   multiple proportions   done clear
  D)
   constant proportions done clear
  View Solution play_arrow

• question_answer61)
  In a reaction of chlorine with excess of ammonia, the number of molecules of ammonia required in the balanced equation is
  A)
   2                                             done clear
  B)
   3 done clear
  C)
   5                                             done clear
  D)
   8   done clear
  View Solution play_arrow

• question_answer62)
  Number of molecules in one litre of water is close to
  A)
   \[\frac{6.023}{23.4}\times {{10}^{23}}\]       done clear
  B)
          \[\text{18 }\times \text{ 6}.0\text{23 }\times \text{ 1}{{0}^{\text{23}}}\] done clear
  C)
   \[\frac{18}{22.4}\times {{10}^{23}}\]       done clear
  D)
          \[\text{55}.\text{5 }\times \text{ 6}.0\text{23 }\times \,\,\text{1}{{0}^{\text{23}}}\]   done clear
  View Solution play_arrow

• question_answer63)
  A balanced chemical equation is in accordance with
  A)
   Avogadro's Law done clear
  B)
   Law of constant proportion done clear
  C)
   Law of conservation of mass   done clear
  D)
   Law of gaseous volumes done clear
  View Solution play_arrow

• question_answer64)
  A gaseous mixture contains oxygen and nitrogen in the ratio of 1: 4 by weight. Therefore, the ratio of their number of molecules is
  A)
   1 :  4                                      done clear
  B)
   1 :  8 done clear
  C)
   7 : 32                                       done clear
  D)
   3 : 16 done clear
  View Solution play_arrow

• question_answer65)
  What will be the ratio of \[c{{l}^{35}}\]and \[c{{l}^{37}}\]respectively in ordinary chlorine if the atomic weight of chlorine is 35.5?
  A)
   1 : 3                       done clear
  B)
          3 : 1   done clear
  C)
   1 : 2                                       done clear
  D)
   2 : 1 done clear
  View Solution play_arrow

• question_answer66)
  Different proportions of oxygen in the various oxides of nitrogen proves the law of
  A)
   equivalent pro portions done clear
  B)
   conservation of mass done clear
  C)
   multiple proportions   done clear
  D)
   constant proportions done clear
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