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MCQs

Total Questions : 108 | Page 8 of 11 pages
Question 71. Hydrogen bonds and hydrophilic interactions are types of
  1.    weak chemical bonds that hold together the atoms within a molecule
  2.    strong chemical bonds that hold together the atoms within a molecule
  3.    weak chemical bonds that link together separate molecules
  4.    strong chemical bonds that link together separate molecules
 Discuss Question
Answer: Option C. -> weak chemical bonds that link together separate molecules
Answer: (c).weak chemical bonds that link together separate molecules
Question 72. What is the concentration of OH⁻ in a solution with a H⁺ concentration of 1.3×10⁻⁴ M?
  1.    7.7×10⁻¹⁰ M
  2.    7.7×10⁻⁹ M
  3.    7.7×10⁻¹¹ M
  4.    7.7×10⁻¹² M
 Discuss Question
Answer: Option C. -> 7.7×10⁻¹¹ M
Answer: (c).7.7×10⁻¹¹ M
Question 73. Which of the following is an isotonic solution?
  1.    0.9% sodium chloride
  2.    0.45% sodium chloride
  3.    Oceans
  4.    10% dextrose in water
 Discuss Question
Answer: Option A. -> 0.9% sodium chloride
Answer: (a).0.9% sodium chloride
Question 74. Which of the following bases has the highest pKₐ value?
  1.    NaOH
  2.    NaNO₃
  3.    KNO₃
  4.    KCl
 Discuss Question
Answer: Option A. -> NaOH
Answer: (a).NaOH
Question 75. Which of the following acids has the lowest pKₐ value?
  1.    Acetic acid
  2.    Sulphuric acid
  3.    Dil.HCl
  4.    Oxalic acid
 Discuss Question
Answer: Option B. -> Sulphuric acid
Answer: (b).Sulphuric acid
Question 76. Identify the triprotic acid from the following.
  1.    Carbonic acid
  2.    Bicarbonate
  3.    Glycine
  4.    Phosphoric acid
 Discuss Question
Answer: Option D. -> Phosphoric acid
Answer: (d).Phosphoric acid
Question 77. Which of the following organic groups are found in naturally occuring amino acids?
  1.    All of these
  2.    Indole
  3.    Imidazole
  4.    Guanidinium ion
 Discuss Question
Answer: Option A. -> All of these
Question 78. The reactions of molecules
  1.    All of these
  2.    require an enzyme in all cases
  3.    are independent of the functional groups
  4.    are the reactions of the functional groups
 Discuss Question
Answer: Option D. -> are the reactions of the functional groups
Question 79. 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.    Henderson-Hasselbalch equation
  2.    Michaelis-Menten equation
  3.    Haldanes equation
  4.    Hardy-Windberg law
 Discuss Question
Answer: Option A. -> Henderson-Hasselbalch equation
Question 80. Polyprotic acids such as H3PO4, can act as acid-base buffers
  1.    at pH values around any of their pKa's
  2.    only in combination with polyprotic bases
  3.    if their concentration is kept low
  4.    at pH values around neutrality
 Discuss Question
Answer: Option A. -> at pH values around any of their pKa's

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