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MCQs

Total Questions : 108 | Page 9 of 11 pages
Question 81. The pH of a solution is determined by
  1.    concentration of salt
  2.    environmental effect
  3.    dielectric constant of the medium
  4.    relative concentration of acids and bases
 Discuss Question
Answer: Option D. -> relative concentration of acids and bases
Question 82. Buffer solutions
  1.    tend to maintain a relatively constant pH.
  2.    cause a decrease in pH when acids are added to them.
  3.    will always have a pH of 7
  4.    are rarely found in living systems
 Discuss Question
Answer: Option A. -> tend to maintain a relatively constant pH.
Question 83. Salt dissolves well in water as water molecules
  1.    surround the ions because of their charge but do not form hydrogen bonds
  2.    form hydrogen bonds with the positively and negatively charged ions
  3.    share electrons with the ions to make polar covalent bonds
  4.    make nonpolar covalent bonds with the positively charged ions only
 Discuss Question
Answer: Option A. -> surround the ions because of their charge but do not form hydrogen bonds
Question 84. Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.
  1.    ionic
  2.    noncovalent
  3.    hydrogen
  4.    covalent
 Discuss Question
Answer: Option D. -> covalent
Question 85. Most of the important functional groups in biological molecules contain
  1.    nitrogen and a phosphate
  2.    oxygen and a phosphate
  3.    oxygen and/or nitrogen and are acidic
  4.    oxygen and/or nitrogen and are polar
 Discuss Question
Answer: Option D. -> oxygen and/or nitrogen and are polar
Question 86. A Bronsted acid becomes __________ upon losing a proton.
  1.    highly reactive
  2.    its conjugate base
  3.    its conjugate acid
  4.    a hydronium ion
 Discuss Question
Answer: Option B. -> its conjugate base
Question 87. What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?
  1.    1 x 10-7
  2.    5 x 10-7
  3.    7 x 10-7
  4.    7
 Discuss Question
Answer: Option A. -> 1 x 10-7
Question 88. Which of the following acid/base pairs act as natural buffers in living systems?
  1.    All of these
  2.    H2PO4-/HPO42-
  3.    Histidine+/histidine
  4.    H2CO3/HCO3-
 Discuss Question
Answer: Option A. -> All of these
Question 89. If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?
  1.    be repelled by water
  2.    It will act as a buffer and stabilize the pH
  3.    It will form a membrane in water
  4.    It will be attracted to water
 Discuss Question
Answer: Option A. -> be repelled by water
Question 90. Which of the following alcohols would be most soluble in water?
  1.    butanol
  2.    octanol
  3.    methanol
  4.    ethanol
 Discuss Question
Answer: Option C. -> methanol

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