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MCQs

Total Questions : 108 | Page 7 of 11 pages
Question 61. The buffer capacity is equal to __________
  1.    Δn / ΔpH
  2.    pH / Δn
  3.    ± 1pKₐ
  4.    ± 2pKₐ
 Discuss Question
Answer: Option A. -> Δn / ΔpH
Answer: (a).Δn / ΔpH
Question 62. Hydrolysis reactions are catalyzed by enzymes called ___________
  1.    Oxidoreductase
  2.    Ligase
  3.    Hydrolase
  4.    Isomerase
 Discuss Question
Answer: Option C. -> Hydrolase
Answer: (c).Hydrolase
Question 63. What does it mean when we say that water acts as a “heat buffer”?
  1.    It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates.
  2.    It increases the temperature of an organism as the temperature of the surroundings increases
  3.    It decreases the temperature of an organism as the temperature of the surroundings increases
  4.    It increases the temperature of an organism as the temperature of the surroundings decreases
 Discuss Question
Answer: Option A. -> It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates.
Answer: (a).It keeps the temperature of an organism relatively constant as the temperature of the surroundings fluctuates.
Question 64. Which of the following does not react with water?
  1.    Barium
  2.    Calcium
  3.    Beryllium
  4.    Strontium
 Discuss Question
Answer: Option C. -> Beryllium
Answer: (c).Beryllium
Question 65. What trend does the reactivity of group II elements follow with water?
  1.    Increases down the group
  2.    Decreases down the group
  3.    Does not follow any particular trend
  4.    No reaction
 Discuss Question
Answer: Option A. -> Increases down the group
Answer: (a).Increases down the group
Question 66. Which among the following statements is true about the following chemical reaction?
3Fe(s) + 4H₂O → Fe₃O₄ (s) + 4H₂
  1.    Iron metal is getting reduced
  2.    Water is acting as a reducing agent
  3.    Water is acting as an oxidizing agent
  4.    Water is getting oxidized
 Discuss Question
Answer: Option C. -> Water is acting as an oxidizing agent
Answer: (c).Water is acting as an oxidizing agent
Question 67. The effectiveness or capacity of a buffer solution can be affected by
  1.    molar concentration of the buffer components
  2.    concentration of the conjugate base to the weak acid
  3.    both (a) and (b)
  4.    temperature of buffer components
 Discuss Question
Answer: Option C. -> both (a) and (b)
Answer: (c).both (a) and (b)
Question 68. Who discovered and described the blood groups (ABO) classification?
  1.    Theodor Kocher
  2.    Karl Landsteiner
  3.    Otto Warburg
  4.    Karl Hooper
 Discuss Question
Answer: Option B. -> Karl Landsteiner
Answer: (b).Karl Landsteiner
Question 69. Which of the following organic groups are found in naturally occuring amino acids?
  1.    Guanidinium ion
  2.    Indole
  3.    Imidazole
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Answer: (d).All of these
Question 70. H₂O and CH₄ are both examples of
  1.    molecules
  2.    ions
  3.    acids
  4.    none of these
 Discuss Question
Answer: Option A. -> molecules
Answer: (a).molecules

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