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MCQs

Total Questions : 108 | Page 4 of 11 pages
Question 31. Which of the following is a hypotonic solution?
  1.    10% dextrose in water
  2.    0.45% sodium chloride
  3.    5% dextrose in 0.9% sodium chloride
  4.    Oceans
 Discuss Question
Answer: Option B. -> 0.45% sodium chloride
Answer: (b).0.45% sodium chloride
Question 32. Polyprotic acids such as H₃PO₄, can act as acid-base buffers
  1.    only in combination with polyprotic bases
  2.    if their concentration is kept low
  3.    at pH values around neutrality
  4.    at pH values around any of their pKa's
 Discuss Question
Answer: Option D. -> at pH values around any of their pKa's
Answer: (d).at pH values around any of their pKa's
Question 33. The pH of a solution is determined by
  1.    concentration of salt
  2.    relative concentration of acids and bases
  3.    dielectric constant of the medium
  4.    environmental effect
 Discuss Question
Answer: Option B. -> relative concentration of acids and bases
Answer: (b).relative concentration of acids and bases
Question 34. The reactions of molecules
  1.    are the reactions of the functional groups
  2.    are independent of the functional groups
  3.    require an enzyme in all cases
  4.    all of the above
 Discuss Question
Answer: Option A. -> are the reactions of the functional groups
Answer: (a).are the reactions of the functional groups
Question 35. Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?
  1.    Michaelis-Menten equation
  2.    Haldanes equation
  3.    Henderson-Hasselbalch equation
  4.    Hardy-Windberg law
 Discuss Question
Answer: Option C. -> Henderson-Hasselbalch equation
Answer: (c).Henderson-Hasselbalch equation
Question 36. Which of the following will easily dissolve in a polar solvent?
  1.    gasoline (heptanes & octanes)
  2.    methane
  3.    argon
  4.    sodium chloride
 Discuss Question
Answer: Option D. -> sodium chloride
Answer: (d).sodium chloride
Question 37. The elements oxygen, nitrogen, and carbon
  1.    can all form covalent bonds with other elements
  2.    contain protons and neutrons in their atomic nuclei
  3.    are common elements in the molecules that make up living organisms
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Answer: (d).All of the above
Question 38. Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.
  1.    noncovalent
  2.    covalent
  3.    ionic
  4.    hydrogen
 Discuss Question
Answer: Option B. -> covalent
Answer: (b).covalent
Question 39. A Bronsted acid becomes __________ upon losing a proton.
  1.    highly reactive
  2.    its conjugate acid
  3.    its conjugate base
  4.    a hydronium ion
 Discuss Question
Answer: Option C. -> its conjugate base
Answer: (c).its conjugate base
Question 40. Buffer solutions
  1.    will always have a pH of 7
  2.    are rarely found in living systems
  3.    cause a decrease in pH when acids are added to them.
  4.    tend to maintain a relatively constant pH.
 Discuss Question
Answer: Option D. -> tend to maintain a relatively constant pH.
Answer: (d).tend to maintain a relatively constant pH.

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