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MCQs

Total Questions : 108 | Page 11 of 11 pages
Question 101. The strength of an acid depends on
  1.    electronegativity
  2.    number of neutrons gain
  3.    number of protons released
  4.    number of double bonds
 Discuss Question
Answer: Option A. -> electronegativity
Question 102. The main difference between an acid and a base is that
  1.    bases donate hydrogen ions in water while acids accept hydrogen ions
  2.    acids donate hydrogen ions in water while bases accept hydrogen ions
  3.    acids are polar molecules and bases are not
  4.    bases are polar molecules and acids are not
 Discuss Question
Answer: Option B. -> acids donate hydrogen ions in water while bases accept hydrogen ions
Question 103. Weak acids generally have pKa
  1.    been seldom found in living systems
  2.    pKa values greater than 2
  3.    that cannot be used to buffer
  4.    values less than 1
 Discuss Question
Answer: Option B. -> pKa values greater than 2
Question 104. The reason that fats contain more energy than simple sugars, is fats have many more
  1.    hydrogen bonds
  2.    carbon atoms
  3.    hydrogen atoms
  4.    covalent bonds
 Discuss Question
Answer: Option D. -> covalent bonds
Question 105. Which of the following character does not apply to water?
  1.    The water molecule is asymmetric
  2.    The covalent bonds in water are highly polarized
  3.    All three atoms in the water molecule readily form hydrogen bonds
  4.    The water molecule readily forms hydrophobic interactions
 Discuss Question
Answer: Option D. -> The water molecule readily forms hydrophobic interactions
Question 106. The dissociation constant of H2O at 25° C is
  1.    1014 M
  2.    107 M
  3.    10-7 M
  4.    10-14 M
 Discuss Question
Answer: Option D. -> 10-14 M
Question 107. Which of the following will easily dissolve in a polar solvent?
  1.    sodium chloride
  2.    gasoline (heptanes & octanes)
  3.    argon
  4.    methane
 Discuss Question
Answer: Option A. -> sodium chloride
Question 108. The elements oxygen, nitrogen, and carbon
  1.    All of these
  2.    contain protons and neutrons in their atomic nuclei
  3.    can all form covalent bonds with other elements
  4.    are common elements in the molecules that make up living organisms
 Discuss Question
Answer: Option A. -> All of these

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