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

done Percentage composition and Molecular formula Total Questions - 7

• question_answer1)
  The percentage of oxygen in \[NaOH\] is           [CPMT 1979]
  A)
                  40           done clear
  B)
                  60 done clear
  C)
                  8              done clear
  D)
                  10 done clear
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• question_answer2)
  The percentage of nitrogen in urea is about      [KCET 2001]
  A)
                  46           done clear
  B)
                  85 done clear
  C)
                  18           done clear
  D)
                  28 done clear
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• question_answer3)
  If two compounds have the same empirical formula but different molecular formula, they must have [MP PMT 1986]
  A)
                  Different percentage composition done clear
  B)
                  Different molecular weights done clear
  C)
                  Same viscosity done clear
  D)
                  Same vapour density done clear
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• question_answer4)
  A compound (80 g) on analysis gave C = 24 g, H = 4 g,   O = 32 g. Its empirical formula is                    [CPMT 1981]
  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_answer5)
  The empirical formula of a compound is \[C{{H}_{2}}O.\] 0.0835 moles of the compound contains 1.0 g of hydrogen. Molecular formula of the compound is
  A)
                  \[{{C}_{2}}{{H}_{12}}{{O}_{6}}\]               done clear
  B)
                  \[{{C}_{5}}{{H}_{10}}{{O}_{5}}\] done clear
  C)
                  \[{{C}_{4}}{{H}_{8}}{{O}_{8}}\]  done clear
  D)
                  \[{{C}_{3}}{{H}_{6}}{{O}_{3}}\] done clear
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• question_answer6)
  The empirical formula of an acid is \[C{{H}_{2}}{{O}_{2}}\], the probable molecular formula of acid may be                    [AFMC 2000]
  A)
                  \[C{{H}_{2}}O\]  done clear
  B)
                  \[C{{H}_{2}}{{O}_{2}}\] done clear
  C)
                  \[{{C}_{2}}{{H}_{4}}{{O}_{2}}\]  done clear
  D)
                  \[{{C}_{3}}{{H}_{6}}{{O}_{4}}\] done clear
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• question_answer7)
  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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