Solved papers for NEET Chemistry Concepts of Acids & Bases NEET PYQ-Concepts Of Acids Bases

done NEET PYQ-Concepts Of Acids Bases Total Questions - 26

• question_answer1) How many gram of dibasic acid (mol. wt. 200) should be present in 100 mL of the aqueous solution to give 0.1 N?                    [AIPMT 1999]
  A)
   1 g   
  done clear
  B)
                    2 g                  
  done clear
  C)
   10 g    
  done clear
  D)
                   20 g
  done clear
  View Answer play_arrow

• question_answer2) The strongest conjugate base is:                                                                                          [AIPMT 1999]
  A)
   \[NO_{3}^{-}\]                       
  done clear
  B)
  \[C{{l}^{-}}\] 
  done clear
  C)
   \[SO_{4}^{2-}\]     
  done clear
  D)
             \[C{{H}_{3}}CO{{O}^{-}}\]
  done clear
  View Answer play_arrow

• question_answer3) The conjugate acid of \[NH_{2}^{-}\] is:                                                                                      [AIPMT 2000]
  A)
   \[{{N}_{2}}{{H}_{4}}\]         
  done clear
  B)
  \[NH_{4}^{+}\]          
  done clear
  C)
   \[N{{H}_{2}}OH\] 
  done clear
  D)
   \[N{{H}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer4) In \[H{{S}^{-}},\,\,{{I}^{-}},\,\,RN{{H}_{2}},\,\,N{{H}_{3}}\] order of proton accepting tendency will be:       [AIPMT 2001]
  A)
   \[{{I}^{-}}>N{{H}_{3}}>RN{{H}_{2}}>H{{S}^{-}}\]
  done clear
  B)
                    \[N{{H}_{3}}>RN{{H}_{2}}>H{{S}^{-}}>{{I}^{-}}\]
  done clear
  C)
   \[RN{{H}_{2}}>N{{H}_{3}}>H{{S}^{-}}>{{I}^{-}}\]
  done clear
  D)
                    \[H{{S}^{-}}>RN{{H}_{2}}>N{{H}_{3}}>{{I}^{-}}\]
  done clear
  View Answer play_arrow

• question_answer5) Which of the following order is wrong?                                                                   [AIPMT 2002]
  A)
         \[N{{H}_{3}}<\text{ }P{{H}_{3}}<\text{ }As{{H}_{3}}\]acidic
  done clear
  B)
                    \[Li<Be<B<C-\]1st IP
  done clear
  C)
   \[A{{I}_{2}}{{O}_{3}}<MgO<N{{a}_{2}}O<{{K}_{2}}O\]basic
  done clear
  D)
        \[L{{i}^{+}}<N{{a}^{+}}<{{K}^{+}}<C{{s}^{+}}-\]ionic radius
  done clear
  View Answer play_arrow

• question_answer6) Which one of the following orders of acid strength is correct?                                      [AIPMT 2003]
  A)
  \[RCOOH>HOH>HC~CH>ROH\]        
  done clear
  B)
        \[RCOOH>HC~CH>HOH>ROH\]
  done clear
  C)
   \[RCOOH>ROH>HOH>HC~CH\]       
  done clear
  D)
   \[RCOOH>HOH>ROH>HC~CH\]
  done clear
  View Answer play_arrow

• question_answer7) Which is the best description of behaviour of bromine in the reaction given below\[{{H}_{2}}O+B{{r}_{2}}\xrightarrow[{}]{{}}HBr+HOBr\]                                   [AIPMT (S) 2004]
  A)
   Proton accepted only
  done clear
  B)
   Both oxidised and reduced
  done clear
  C)
   Oxidised only
  done clear
  D)
   Reduced only
  done clear
  View Answer play_arrow

• question_answer8) The correct order of acid strength is:                                                                                  [AIPMT (S) 2005]
  A)
   \[HClO<HCl{{O}_{2}}<HCl{{O}_{3}}<HCI{{O}_{4}}\]
  done clear
  B)
              \[HCl{{O}_{4}}<HClO<HCl{{O}_{2}}<HCl{{O}_{3}}\]
  done clear
  C)
   \[HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}<HClO\]
  done clear
  D)
   \[HCl{{O}_{4}}<HCl{{O}_{3}}<HCl{{O}_{2}}<HClO\]
  done clear
  View Answer play_arrow

• question_answer9) Which of the following is not a correct statement?                                                                [AIPMT (S) 2006]
  A)
         The electron-deficient molecules can act as Lewis acids
  done clear
  B)
   The canonical structures have no real existence
  done clear
  C)
        Every AB5 molecule does in fact have square pyramid structure
  done clear
  D)
        Multiple bonds are always shorter than corresponding single bonds
  done clear
  View Answer play_arrow

• question_answer10) Which one of the following orders is not in accordance with the property stated against it?        [AIPMT (S) 2006]
  A)
         \[{{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}:\]Oxidising power      
  done clear
  B)
  \[HI>HBr>HCI>HF:\]Acidic property in water
  done clear
  C)
        \[{{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}:\]Electronegativity
  done clear
  D)
        \[{{F}_{2}}>C{{l}_{2}}>B{{r}_{2}}>{{I}_{2}}:\] Bond dissociation energy
  done clear
  View Answer play_arrow

• question_answer11) Which of die following represents the correct order of the acidity in the given compounds?         [AIPMT (S) 2007]
  A)
   \[C{{H}_{3}}COOH>BrC{{H}_{2}}COOH>ClC{{H}_{2}}COOH\] \[>FC{{H}_{2}}COOH\]
  done clear
  B)
        \[FC{{H}_{2}}COOH>C{{H}_{3}}COOH>BrC{{H}_{2}}COOH\]\[>ClC{{H}_{2}}COOH\]
  done clear
  C)
        \[BrC{{H}_{2}}COOH>CIC{{H}_{2}}COOH>FC{{H}_{2}}COOH\]\[>C{{H}_{3}}COOH\]
  done clear
  D)
        \[FC{{H}_{2}}COOH>ClC{{H}_{2}}COOH>BrC{{H}_{2}}COOH\]\[>C{{H}_{3}}COOH\]
  done clear
  View Answer play_arrow

• question_answer12) Which one of the following ionic species has the greatest proton affinity to form stable compound?        [AIPMT (S) 2007]
  A)
   \[H{{S}^{-}}\]
  done clear
  B)
                    \[NH_{2}^{-}\]
  done clear
  C)
   \[{{F}^{-}}\]  
  done clear
  D)
                    \[{{I}^{-}}\]
  done clear
  View Answer play_arrow

• question_answer13) Which one of the following orders correctly represents the increasing acid strengths of the given acids?    [AIPMT (S) 2007]
  A)
   \[HOCl<HOClO<HOCl{{O}_{2}}<HOCl{{O}_{3}}\]
  done clear
  B)
   \[HOClO<HOCl<HOCl{{O}_{3}}<HOCI{{O}_{2}}\]
  done clear
  C)
   \[HOCl{{O}_{2}}<HOCl{{O}_{3}}<HOClO<HOCl\]
  done clear
  D)
   \[HOCl{{O}_{3}}<HOCl{{O}_{2}}<HOClO<HOCl\]
  done clear
  View Answer play_arrow

• question_answer14) 

  Base strength of                                                                                                          [AIPMT (S) 2008]

  (1) \[{{H}_{3}}C\overset{\Theta }{\mathop{C}}\,{{H}_{2}}\]

  (2) \[{{H}_{2}}C=\overset{\Theta }{\mathop{C}}\,H\]and

  (3) \[H-C\equiv \overset{\Theta }{\mathop{C}}\,\] is in the order of

  A)
   (2) > (1) > (3)  
  done clear
  B)
        (3) > (2) > (1)
  done clear
  C)
   (1) > (3) > (2)             
  done clear
  D)
   (1) > (2) > (3)
  done clear
  View Answer play_arrow

• question_answer15) Which of the following molecules acts as a Lewis acid?                                                          [AIPMT (S) 2009]
  A)
   \[{{(C{{H}_{3}})}_{3}}B\]     
  done clear
  B)
        \[{{(C{{H}_{3}})}_{2}}O\]
  done clear
  C)
   \[{{(C{{H}_{3}})}_{2}}P\]     
  done clear
  D)
        \[{{(C{{H}_{3}})}_{3}}N\]
  done clear
  View Answer play_arrow

• question_answer16) Which one of the following molecular hydrides acts as a Lewis acid?                                        [AIPMT (S) 2010]
  A)
   \[N{{H}_{3}}\]           
  done clear
  B)
        \[{{H}_{2}}O\]
  done clear
  C)
   \[{{B}_{2}}{{H}_{6}}\]         
  done clear
  D)
        \[C{{H}_{4}}\]
  done clear
  View Answer play_arrow

• question_answer17) Which of the following is least likely to behave as Lewis base?                                                 [AIPMT (S) 2011]
  A)
   \[N{{H}_{3}}\]           
  done clear
  B)
        \[B{{F}_{3}}\]                         
  done clear
  C)
   \[O{{H}^{-}}\]       
  done clear
  D)
   \[{{H}_{2}}O\]
  done clear
  View Answer play_arrow

• question_answer18) The correct order of decreasing acid strength of trichloroacedc acid , trifluoroacetic acid, acetic acid  and formic acid  is                                                                                                                          [AIPMT (S) 2012]
  A)
   B > A > D > C
  done clear
  B)
      B > D > C > A
  done clear
  C)
   A > B > C > D 
  done clear
  D)
        A > C > B > D
  done clear
  View Answer play_arrow

• question_answer19) In which of the following arrangements the given sequence is not strictly according to the property indicated against it?         [AIPMT (M) 2012]
  A)
   \[HF<HCl<HBr,HI:\] increasing acidic strength
  done clear
  B)
  \[{{H}_{2}}O<{{H}_{2}}S<{{H}_{2}}Se<{{H}_{2}}Te:\] increasing \[p{{K}_{a}}\] values
  done clear
  C)
   \[N{{H}_{3}}<p{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}:\] increasing acidic character
  done clear
  D)
   \[C{{O}_{2}}<Si{{O}_{2}}<Sn{{O}_{2}}<Pb{{O}_{2}}\]: increasing oxidising power
  done clear
  View Answer play_arrow

• question_answer20) Which is the strongest acid in the following?                                                                                    [NEET 2013]
  A)
   \[{{H}_{2}}S{{O}_{4}}\]       
  done clear
  B)
       \[HCl{{O}_{3}}\]         
  done clear
  C)
   \[HCl{{O}_{4}}\]        
  done clear
  D)
        \[{{H}_{2}}S{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer21)   Which of these is least likely to act as a Lewis base?                                                                                    [NEET 2013]
  A)
   CO                 
  done clear
  B)
       \[{{F}^{-}}\]               
  done clear
  C)
   \[B{{F}_{3}}\]            
  done clear
  D)
        \[P{{F}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer22) Acidity of diprotic acids in aqueous solutions increases in the order                                         [AIPMT 2014]
  A)
   \[{{H}_{2}}S<{{H}_{2}}Se<{{H}_{2}}Te\]
  done clear
  B)
        \[{{H}_{2}}Se<{{H}_{2}}S<{{H}_{2}}Te\]
  done clear
  C)
   \[{{H}_{2}}Te<{{H}_{2}}S<{{H}_{2}}Se\]
  done clear
  D)
        \[{{H}_{2}}Se<{{H}_{2}}Te<{{H}_{2}}S\]
  done clear
  View Answer play_arrow

• question_answer23) Among the following, the correct order of acidity is                                                                          [NEET - 2016]
  A)
   \[HCl{{O}_{3}}<HCl{{O}_{4}}<HCl{{O}_{2}}<HClO\]
  done clear
  B)
   \[~HClO<HCl{{O}_{2}}<HCl{{O}_{3}}<HCl{{O}_{4}}\]
  done clear
  C)
   \[HCl{{O}_{2}}<HClO<HCl{{O}_{3}}<HCl{{O}_{4}}\]
  done clear
  D)
   \[HCl{{O}_{4}}<HCl{{O}_{2}}<HClO<HCl{{O}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer24) Which one is the correct order of acidity?                                                                     [NEET-2017]
  A)
   \[C{{H}_{3}}=C{{H}_{3}}>C{{H}_{2}}=C{{H}_{2}}>C{{H}_{3}}-C\]\[=CH>CH=CH\]
  done clear
  B)
   \[C{{H}_{2}}=C{{H}_{2}}>C{{H}_{3}}-CH=C{{H}_{2}}>C{{H}_{3}}-C\]\[\equiv CH>CH\equiv CH\]
  done clear
  C)
   \[CH\equiv CH>C{{H}_{3}}-C\equiv CH>C{{H}_{2}}\]\[=C{{H}_{2}}>C{{H}_{3}}-C{{H}_{3}}\]
  done clear
  D)
   \[CH\equiv CH>C{{H}_{2}}=C{{H}_{2}}>C{{H}_{3}}-C\]\[\equiv CH>C{{H}_{3}}-C{{H}_{3}}\]
  done clear
  View Answer play_arrow

• question_answer25) Conjugate base for Bronsted acids \[{{H}_{2}}O\]and HF are:                                            [NEET 2019]
  A)
   \[O{{H}^{}}\]and\[{{F}^{}}\], respectively
  done clear
  B)
   \[{{H}_{3}}{{O}^{+}}\]and\[{{H}_{2}}{{F}^{+}}\], respectively
  done clear
  C)
   \[O{{H}^{}}\]and\[{{H}_{2}}{{F}^{+}}\], respectively
  done clear
  D)
   \[{{H}_{3}}{{O}^{+}}\]and\[{{F}^{}}\], respectively
  done clear
  View Answer play_arrow

• question_answer26) Which will make basic buffer?                                                                                           [NEET 2019]
  A)
   \[100\text{ }mL\text{ }of\text{ }0.1\text{ }M\text{ }HCl+200\text{ }mL\text{ }of\text{ }\]\[0.1M\text{ }N{{H}_{4}}OH\]
  done clear
  B)
  \[100\text{ }mL\text{ }of\text{ }0.1\text{ }M\text{ }HCl+100\text{ }mL\text{ }of\text{ }\]\[0.1\text{ }M\text{ }NHOH\]
  done clear
  C)
   \[50\text{ }mL\text{ }of\text{ }0.1\text{ }M\text{ }NaOH+25\text{ }mL\text{ }of\]\[0.1\text{ }M\text{ }C{{H}_{3}}COOH\]
  done clear
  D)
   \[100\text{ }mL\text{ }of\text{ }0.1\text{ }M\text{ }C{{H}_{3}}COOH+100\]\[mL\text{ }of\text{ }0.1\text{ }M\text{ }NaOH\]
  done clear
  View Answer play_arrow