Solved papers for NEET Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ NEET PYQ-Some Basic Concepts Chemistry

done NEET PYQ-Some Basic Concepts Chemistry Total Questions - 38

• question_answer1) Given the number, 161 cm, 0.161 cm, 0.0161 cm. The number of significant figures for the three numbers is:                                                                                                                                                                           [AIPMT 1998]
  A)
   3, 4 and 5, respectively              
  done clear
  B)
   3, 4 and 4, respectively
  done clear
  C)
   3, 3 and 4, respectively              
  done clear
  D)
        3, 3 and 3, respectively
  done clear
  View Answer play_arrow

• question_answer2) 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 is 56) present in one molecule of haemoglobin are:                             [AIPMT 1998]
  A)
   1                    
  done clear
  B)
        6                    
  done clear
  C)
   4                    
  done clear
  D)
        2
  done clear
  View Answer play_arrow

• question_answer3) An organic compound containing C, H and N gave the following results on analysis C = 40%, H = 13.33%, N = 46.67%. Its empirical formula would be:                                                                                                  [AIPMT 1998]
  A)
   \[{{C}_{2}}{{H}_{7}}{{N}_{2}}\]
  done clear
  B)
                    \[C{{H}_{5}}N\]         
  done clear
  C)
   \[C{{H}_{4}}N\]
  done clear
  D)
                    \[{{C}_{2}}{{H}_{7}}N\]
  done clear
  View Answer play_arrow

• question_answer4) In the reaction \[4N{{H}_{3}}(g)+5{{O}_{2}}(g)\to \]\[4NO(g)+6{{H}_{2}}O(l)\]  when 1 mole of ammonia and 1 mole of \[{{O}_{2}}\] are made to react to completion then :                                                        [AIPMT 1998]
  A)
   1.0 mole of \[{{H}_{2}}O\] is produced
  done clear
  B)
                    1.0 mole of NO will be produced
  done clear
  C)
        all the oxygen will be consumed  
  done clear
  D)
   all the ammonia will be consumed
  done clear
  View Answer play_arrow

• question_answer5) The number of atoms in 4.25 g of \[N{{H}_{3}}\] is approximately:                                  [AIPMT 1999]
  A)
   \[1\times {{10}^{23}}\]          
  done clear
  B)
        \[2\times {{10}^{23}}\]          
  done clear
  C)
   \[4\times {{10}^{23}}\]          
  done clear
  D)
        \[6\times {{10}^{23}}\]          
  done clear
  View Answer play_arrow

• question_answer6) An organic compound containing C, H and N gave the following analysis C = 40% H = 13.33% and N = 46.67%. Its empirical formula would be:                                                                                                      [AIPMT 1999]
  A)
  CHN    
  done clear
  B)
                    \[{{C}_{2}}{{H}_{2}}N\]       
  done clear
  C)
   \[C{{H}_{4}}N\]
  done clear
  D)
                    \[{{C}_{2}}{{H}_{7}}N\]
  done clear
  View Answer play_arrow

• question_answer7) Assuming fully decomposed, the volume of \[C{{O}_{2}}\] released at STP on heating 9.85 g of \[BaC{{O}_{3}}\] (Atomic mass, Ba = 137) will be:                                                                                                  [AIPMT 2000]
  A)
   1.12 L                         
  done clear
  B)
   0.84 L 
  done clear
  C)
   2.24 L
  done clear
  D)
                    4.06 L
  done clear
  View Answer play_arrow

• question_answer8) Molarity of liquid HCl if density of solution is 1.17 g/cc:                                         [AIPMT 2001]
  A)
   36.5
  done clear
  B)
                    18.25
  done clear
  C)
   32.05
  done clear
  D)
                    42.10
  done clear
  View Answer play_arrow

• question_answer9) Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4), then minimum molecular weight of peroxidase anhydrous enzyme is:                                                                                         [AIPMT 2001]
  A)
   \[1.568\times {{10}^{4}}\]                  
  done clear
  B)
   \[1.568\times {{10}^{3}}\]
  done clear
  C)
   15.68
  done clear
  D)
                    \[2.168\times {{10}^{4}}\]
  done clear
  View Answer play_arrow

• question_answer10) Specific volume of cylindrical virus particle is \[6.02\times {{10}^{-2}}\,cc/g\] whose radius and length are \[7\,\overset{o}{\mathop{A}}\,\] and \[10\,\overset{o}{\mathop{A}}\,\] respectively. If \[{{N}_{A}}=\,\,6.02\times {{10}^{23}}\] find molecular weight of virus:                                                                     [AIPMT 2001]
  A)
   15.4 kg/mol      
  done clear
  B)
   \[1.54\times {{10}^{4}}kg/mol\]
  done clear
  C)
   \[3.08\times {{10}^{4}}kg/mol\]          
  done clear
  D)
   \[3.08\times {{10}^{3}}kg/mol\]
  done clear
  View Answer play_arrow

• question_answer11) 1M and 2.5 litre NaOH solution mixed with another 0.5 M and 3 L NaOH solution. Then find out molarity of resultant solution.                                                                                                                           [AIPMT 2002]
  A)
   0.80 M  
  done clear
  B)
                                1.0 M  
  done clear
  C)
   0.73 M  
  done clear
  D)
                    0.50 M
  done clear
  View Answer play_arrow

• question_answer12) Which has maximum molecules?                                                                                                  [AIPMT 2002]
  A)
   \[7\,g\,{{N}_{2}}\]
  done clear
  B)
                    \[7\,g\,{{H}_{2}}\]
  done clear
  C)
   \[16\,g\,N{{O}_{2}}\]
  done clear
  D)
                    \[16\,g\,{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer13) The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is:                                                                                                                                    [AIPMT 2002]
  A)
   \[{{C}_{3}}{{H}_{13}}{{N}_{3}}\]               
  done clear
  B)
   \[C{{H}_{2}}N\]
  done clear
  C)
    \[C{{H}_{4}}N\]
  done clear
  D)
                    \[C{{H}_{6}}N\]
  done clear
  View Answer play_arrow

• question_answer14) In Haber process 30 L of dihydrogen and 30 L  of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end?       [AIPMT 2003]
  A)
  20 L ammonia, 10 L nitrogen, 30 L hydrogen
  done clear
  B)
        20 L ammonia, 25 L nitrogen, 15 L hydrogen
  done clear
  C)
        20 L ammonia, 20 L nitrogen, 20 L hydrogen
  done clear
  D)
        10 L ammonia, 25 L nitrogen, 15 L hydrogen
  done clear
  View Answer play_arrow

• question_answer15) The mole fraction of the solute in one molal aqueous solution is:                                           [AIPMT (S) 2005]
  A)
   0.027                    
  done clear
  B)
        0.036  
  done clear
  C)
   0.018    
  done clear
  D)
  0.009
  done clear
  View Answer play_arrow

• question_answer16) Concentrated aqueous sulphuric acid is 98% \[{{H}_{2}}S{{O}_{4}}\] by mass and has a density of \[1.80\text{ }g\text{ }m{{L}^{-1}}.\] Volume of acid required to make one litre of 0.1 M \[{{H}_{2}}S{{O}_{4}}\] solution is:                                                                                                                                     [AIPMT (S) 2007]
  A)
         11.10 mL                    
  done clear
  B)
   16.65 Ml
  done clear
  C)
   22.20 mL
  done clear
  D)
        5.55 mL
  done clear
  View Answer play_arrow

• question_answer17) An element, X has the following isotopic composition;                                                          [AIPMT (S) 2007] \[^{200}X:90%\] \[^{199}X:8.0%\] \[^{202}X:2.0%\] The weighted average atomic mass of the naturally-occurring element X is closest to:
  A)
   200 amu
  done clear
  B)
         201 amu
  done clear
  C)
        202 amu
  done clear
  D)
    199 amu
  done clear
  View Answer play_arrow

• question_answer18) Volume occupied by one molecule of water (density\[=1\,g\,c{{m}^{-3}}\]) is                      [AIPMT (S) 2008]
  A)
   \[9.0\times {{10}^{-}}^{23}c{{m}^{3}}\]
  done clear
  B)
        \[6.023\times {{10}^{-}}^{23}c{{m}^{3}}\]
  done clear
  C)
   \[3.0\times {{10}^{-}}^{23}c{{m}^{3}}\] 
  done clear
  D)
        \[5.5\times {{10}^{-}}^{23}c{{m}^{3}}\]
  done clear
  View Answer play_arrow

• question_answer19) An organic compound contains carbon hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be                                                                       [AIPMT (S) 2008]
  A)
   \[C{{H}_{3}}O\]                     
  done clear
  B)
  \[C{{H}_{2}}O\]          
  done clear
  C)
   \[CHO\]           
  done clear
  D)
        \[C{{H}_{4}}O\]
  done clear
  View Answer play_arrow

• question_answer20) How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?                     [AIPMT (S) 2008]
  A)
   0.044     
  done clear
  B)
   0.333  
  done clear
  C)
   0.011         
  done clear
  D)
   0.029
  done clear
  View Answer play_arrow

• question_answer21)  10 g of hydrogen and 64 of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be                                                                                                                        [AIPMT (S) 2009]
  A)
   2 mol              
  done clear
  B)
        3 mol  
  done clear
  C)
   4 mol              
  done clear
  D)
        1 mol
  done clear
  View Answer play_arrow

• question_answer22)   In the following the most stable conformation of n-butane is                                      [AIPMT (S) 2010]
  A)
   
  done clear
  B)
         
  done clear
  C)
      
  done clear
  D)
          
  done clear
  View Answer play_arrow

• question_answer23) The number of atoms in 0.1 mole of a diatomic gas is \[({{N}_{A}}=6.02\times {{10}^{23}}mo{{l}^{-1}})\] [AIPMT (S) 2010]
  A)
   \[6.026\times {{10}^{22}}\]    
  done clear
  B)
        \[1.806\times {{10}^{23}}\]    
  done clear
  C)
   \[3.600\times {{10}^{23}}\]    
  done clear
  D)
        \[1.800\times {{10}^{22}}\]
  done clear
  View Answer play_arrow

• question_answer24) Mole fraction of the solute in a 1.00 molal aqueous solution is                                              [AIPMT (S) 2011]
  A)
   0.0177         
  done clear
  B)
        0.0344
  done clear
  C)
   1.7700            
  done clear
  D)
        0.1770
  done clear
  View Answer play_arrow

• question_answer25) Which has the maximum number of molecules among the following?                                     [AIPMT (M) 2011]
  A)
   \[44\,g\,C{{O}_{2}}\]  
  done clear
  B)
        \[48\,g\,{{O}_{3}}\]
  done clear
  C)
   \[8\,g\,{{H}_{2}}\]      
  done clear
  D)
        \[64\,g\,S{{O}_{2}}\]
  done clear
  View Answer play_arrow

• question_answer26)  How many grams of concentrated nitric acid solution should be used to prepare 250 mL of \[\text{2}\text{.0}\,\text{M}\]\[HN{{O}_{3}}\]. The concentrated acid is 70% \[HN{{O}_{3}}\].      [NEET 2013]
  A)
   45.0 g conc. \[HN{{O}_{3}}\]   
  done clear
  B)
   90.0 g conc. \[HN{{O}_{3}}\]
  done clear
  C)
   70.0 g cone. \[HN{{O}_{3}}\]
  done clear
  D)
   54.0 g conc. \[HN{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer27)   \[6.02\times {{10}^{20}}\] molecules of urea are present in 100 mL of its solution. The concentration of solution is                                                                                                                                                      [NEET 2013]
  A)
   0.02 M
  done clear
  B)
        0.01 M
  done clear
  C)
   0.001 M          
  done clear
  D)
        0.1 M
  done clear
  View Answer play_arrow

• question_answer28) When 22.4 L of \[{{H}_{2}}(g)\] is mixed with 11.2 L of \[C{{l}_{2}}\] each at STP, the moles of \[HCl(g)\] formed is equal to                                                                                                                                   [AIPMT 2014]
  A)
   1 mole of \[HCl(g)\]
  done clear
  B)
       2 moles of \[HCl(g)\]
  done clear
  C)
   0.5 mole of \[HCl(g)\]    
  done clear
  D)
   1.5 moleof \[HCl(g)\]
  done clear
  View Answer play_arrow

• question_answer29) *1.0 g of magnesium is burnt with 0.56 g \[{{O}_{2}}\] in a closed verssel. Which reactant is left in excess and how much?                                                                                                                                     [AIPMT 2014] \[(At.wt.Mg=24;O=16)\]
  A)
   \[Mg,0.16g\]       
  done clear
  B)
        \[{{O}_{2}}.0.16g\]
  done clear
  C)
   \[Mg,0.44g\]       
  done clear
  D)
        \[{{O}_{2}},0.28g\]
  done clear
  View Answer play_arrow

• question_answer30) If Avogadro number \[{{N}_{A}},\] is changed from \[6.022\times {{10}^{23}}mo{{l}^{-1}}\] to \[6.022\times {{10}^{20}}mo{{l}^{-1}}\] this would change                                                               [NEET 2015 (Re)]
  A)
   the definition of mass in units of grams
  done clear
  B)
   the mass of one mole of carbon
  done clear
  C)
   the ratio of chemical species to each other in a balanced equation
  done clear
  D)
   the ratio of elements to each other in a compound
  done clear
  View Answer play_arrow

• question_answer31) 20.0 g of a magnesium carbonate sample decomposes on heating to give carbon dioxide and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample? (Atomic weight of Mg = 24)   [NEET 2015 (Re)]
  A)
   75       
  done clear
  B)
        96       
  done clear
  C)
   60       
  done clear
  D)
        84
  done clear
  View Answer play_arrow

• question_answer32) 

  What is the mass of precipitate formed when 50 mL of 16.9% solution of \[AgN{{O}_{3}}\] is mixed with 50 mL of 5.8% NaCl solution?                                                                                                                [NEET 2015 (Re)]

  (Ag = 107.8. N =14, O = 16, Na = 23, 01 = 35.5)

  A)
   28 g    
  done clear
  B)
        3.5 g
  done clear
  C)
   7 g        
  done clear
  D)
        14 g
  done clear
  View Answer play_arrow

• question_answer33) What is the mole fraction of the solute in a 1.00 m aqueous solution?                                      [NEET 2015 (Re)]
  A)
   0.177              
  done clear
  B)
        1.770              
  done clear
  C)
   0.0354            
  done clear
  D)
        0.0177
  done clear
  View Answer play_arrow

• question_answer34) The number of water molecules is maximum in                                                       [NEET 2015 (Re)]
  A)
   18 molecules of water
  done clear
  B)
   1.8 g of water
  done clear
  C)
   18 g of water
  done clear
  D)
   18 moles of water
  done clear
  View Answer play_arrow

• question_answer35) Which of the following is dependent on temperature?                                                           [NEET-2017]
  A)
   Weight percentage
  done clear
  B)
       Molality
  done clear
  C)
   Molarity           
  done clear
  D)
        Mole fraction
  done clear
  View Answer play_arrow

• question_answer36) In which case is number of molecules of water maximum?                              [NEET - 2018]
  A)
   0.00224 L of water vapours at 1 atm and 273 K
  done clear
  B)
   0.18 g of water
  done clear
  C)
   18 mL of water
  done clear
  D)
   \[\text{1}{{\text{0}}^{\text{--3}}}\text{ mol}\]of water
  done clear
  View Answer play_arrow

• question_answer37) Which one is a wrong statement?                                                                                [NEET - 2018]
  A)
   The electronic configuration of N atom is
  done clear
  B)
   An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers
  done clear
  C)
   Total orbital angular momentum of electron in 's' orbital is equal to zero
  done clear
  D)
   The value of m for \[{{\text{d}}_{\text{z}}}\text{2}\] is zero
  done clear
  View Answer play_arrow

• question_answer38) Which one of the followings has maximum number of atoms?                                                           [NEET 2020]
  A)
   1 g of Mg(s) [Atomic mass of Mg = 24]
  done clear
  B)
   1 g of O2(g) [Atomic mass of O = 16]
  done clear
  C)
   1 g of Li(s) [Atomic mass of Li = 7]
  done clear
  D)
   1 g of Ag(s) [Atomic mass of Ag = 108]
  done clear
  View Answer play_arrow