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MCQs

Total Questions : 108 | Page 5 of 11 pages
Question 41. Salt dissolves well in water as water molecules
  1.    form hydrogen bonds with the positively and negatively charged ions
  2.    make nonpolar covalent bonds with the positively charged ions only
  3.    surround the ions because of their charge but do not form hydrogen bonds
  4.    share electrons with the ions to make polar covalent bonds
 Discuss Question
Answer: Option C. -> surround the ions because of their charge but do not form hydrogen bonds
Answer: (c).surround the ions because of their charge but do not form hydrogen bonds
Question 42. Most of the important functional groups in biological molecules contain
  1.    oxygen and/or nitrogen and are acidic
  2.    oxygen and a phosphate
  3.    nitrogen and a phosphate
  4.    oxygen and/or nitrogen and are polar
 Discuss Question
Answer: Option D. -> oxygen and/or nitrogen and are polar
Answer: (d).oxygen and/or nitrogen and are polar
Question 43. Which of the following acid/base pairs act as natural buffers in living systems?
  1.    H₂CO₃/HCO₃¯
  2.    H₂PO₄-/HPO₄²¯
  3.    Histidine+/histidine
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 44. What is the concentration, in moles/liter, of the hydrogen ion, if pH of a solution is 7?
  1.    7
  2.    7 x 10^-7
  3.    5 x 10^-7
  4.    1 x 10^-7
 Discuss Question
Answer: Option D. -> 1 x 10^-7
Answer: (d).1 x 10^-7
Question 45. 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 be attracted to water
  3.    It will form a membrane in water
  4.    It will act as a buffer and stabilize the pH
 Discuss Question
Answer: Option A. -> be repelled by water
Answer: (a).be repelled by water
Question 46. Which of the following alcohols would be most soluble in water?
  1.    methanol
  2.    ethanol
  3.    butanol
  4.    octanol
 Discuss Question
Answer: Option A. -> methanol
Answer: (a).methanol
Question 47. A compound that is capable of forming hydrogen bonds with water
  1.    is probably held together by noncovalent bonds
  2.    contains at least some polar covalent bonds
  3.    should act as a good buffer for acids and bases
  4.    does not dissolve well in water
 Discuss Question
Answer: Option B. -> contains at least some polar covalent bonds
Answer: (b).contains at least some polar covalent bonds
Question 48. ΔG is negative for which of the following processes?
  1.    Melting of ice and evaporation of water
  2.    Oxidation of nitrogen
  3.    Oxidation of gold
  4.    Burning of chlorine
 Discuss Question
Answer: Option A. -> Melting of ice and evaporation of water
Answer: (a).Melting of ice and evaporation of water
Question 49. What makes water a liquid at room temperature?
  1.    Hydrogen bonds between water molecules
  2.    Covalent bonding
  3.    Noncovalent interactions
  4.    Van der Waals forces of attraction
 Discuss Question
Answer: Option A. -> Hydrogen bonds between water molecules
Answer: (a).Hydrogen bonds between water molecules
Question 50. ΔH is positive for which of the following processes?
  1.    Oxidation of nitrogen
  2.    Melting of ice and evaporation of water
  3.    Oxidation of gold
  4.    Burning of chlorine
 Discuss Question
Answer: Option B. -> Melting of ice and evaporation of water
Answer: (b).Melting of ice and evaporation of water

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