MCAT Practice Test - Page 4
67. Silicon, a common element, is found in rocks. Which of the following is mostly combined with silicon?
A. Chlorine
B. Oxygen
C. Carbon
D. Sulfur
68. The bonding that explains the variation of the boiling point of water from the boiling point of similarly structured molecules is:
A. Van der Waals forces
B. Covalent bonding
C. Hydrogen bonding
D. Ionic bonding
69. Which of the following is called a DIOL?
A. Glycerol
B. Glycol
C. Methanol
D. Ethanol
70. NaHCO₃ decomposes on heating. In an experiment, a 5 mol sample of NaHCO₃ was heated. What volume of CO₂ will be yielded in the result of this experiment? Reaction is given as follows:
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
2NaHCO₃ → Na₂CO₃ + H₂O + CO₂
A. 24 dm³
B. 60 dm³
C. 35 dm³
D. 48 dm³
71. Rancidity involves:
A. Oxidation and reduction
B. Oxidation and hydrolysis
C. Hydrolysis and reduction
D. Reduction only
72. When glucose is heated with Fehling’s solution, the color of the precipitate obtained is:
A. Black
B. Yellow
C. Red
D. White
73. A compound contains 75% carbon and 25% hydrogen by mass. What is the molecular formula of the compound?
A. CH₄
B. CH₃
C. C₂H₄
D. C₂H₆
74. Which one of the following is electron deficient?
A. NH₃
B. PH₃
C. BCl₃
D. PCl₃
75. In an acetyl molecule, two atoms of carbon are bonded by:
A. Two sigma bonds and two pi (π) bonds
B. One sigma bond and one pi (π) bond
C. Two sigma bonds and one pi (π) bond
D. One sigma bond and two pi (π) bonds
76. Aqua regia is a mixture of HNO₃ and HCl mixed in the ratio of:
A. 3 : 1
B. 1 : 3
C. 2 : 3
D. 3 : 4
77. The chemical reaction "CaCO₃ (s) → CaO (s) + CO₂ (g)" shows:
A. Reduction
B. Oxidation
C. No change in oxidation state
D. Both oxidation and reduction
78. When electric current passes through an aqueous solution, which one of the following ionic migrations is correct?
A. H⁺ ions move towards anode
B. Cl⁻ ions move towards anode
C. Cl⁻ ions move towards cathode
D. Both move towards cathode
79. What is the structure associated with BF₃ molecule?
A. Linear
B. Triangle
C. Trigonal pyramidal
D. Tetrahedron
80. Metals lose electrons more easily than non-metals because of:
A. High ionization potential
B. High electron affinity
C. Low ionization potential
D. Low electronegativity
81. The correct formula of ‘Plaster of Paris’ is:
A. CaSO₄·H₂O
B. CaSO₄·2H₂O
C. CaSO₄·3H₂O
D. CaSO₄·½ H₂O
82. Yeast can be used to convert simple sugars into:
A. Ethanoic acid and oxygen
B. Ethanol and oxygen
C. Ethanol and carbon dioxide
D. Starch and carbon dioxide
83. Down’s cell is used for manufacturing sodium because:
A. Anode does not react with chlorine
B. Sodium floats on the fused sodium chloride
C. Graphite does not react with sodium
D. It is easy to fix graphite in circular form
84. Which type of isomerism is shown by the following compounds?
• CH₃-CH₂-O-CH₂-CH₃
• CH₃-CH₂-CH₂-O-CH₃
• CH₃-CH₂-O-CH₂-CH₃
• CH₃-CH₂-CH₂-O-CH₃
A. Position isomerism
B. Chain isomerism
C. Metamerism
D. Functional isomerism
85. Red lead, commonly known as ‘Sandur’, is represented by the formula:
A. PbO
B. Pb₃O₄
C. PbCrO₄
D. PbCO₃
86. What happens if a reaction is at equilibrium state and some more reactants are added in the container?
A. The equilibrium will not be affected
B. The reverse reaction rate will increase
C. The forward reaction rate will increase
D. The forward reaction rate will decrease
87. How much heat energy is required when 8 grams of hydrogen are burnt? The thermal reaction is: 2H₂ + O₂ → 2H₂O + 136.64 kcal
A. 273.28 kcal
B. 68.32 kcal
C. 136.64 kcal
D. 102.48 kcal
88. Which of the following is NOT a commonly occurring sulfur compound?
A. H₂SO₄
B. H₂S
C. SO₃
D. SO₂
89. The most active non-metal has:
A. Medium electronegativity
B. High electronegativity
C. Low electronegativity
D. Large atomic radius
90. A compound, whose molecular mass is 90 grams, contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen. What is the true formula of the compound?
A. CH₂O₄
B. C₃H₆O
C. C₃HO₃
D. C₂H₂O₄